For questions 42 thru 60, consult the attached Periodic Table of the Elements.  Please do NOT Google these.     What is the atomic number for Selenium (Se)?                                                 ________   How many electrons are in it’s second shell?                                                 ________   How many neutrons does Mercury (Hg) have?                                                 ________   How many electrons does Radium (Ra) have in its outermost shell?                                     ________   How many shells does Bromine (Br) have?                                                             ________   What is the chemical symbol for iron?                                                                                                 ________

Q: Ga-67, an isotope of gallium (Ga), is used medically to scan for various tumors. How many protons…

A: Number of protons is equal to atomic number in a atom. Mass number is the sum of protons and…

Q: Antimony has 2 commonly occurring isotopes. 57.21% of Antimony atoms have 70 neutrons and 51…

A: Given: Antimony has 2 isotopes For first isotope, Abundance = 57.21% , Neutrons = 70 and protons =…

Q: This experiment concerns kinetics and isotopes. Isotopes are atoms of an element that differ only in…

A: Radioactivity : It is the decay process by which atomic nuclei undergoes nuclear changes by loss of…

Q: Are electrons, protons, or neutrons the smallest particles? If not, what are? (Explain in 200 words)

A: A matter is made up of molecules. Where as atoms are the building block of molecules.  Atom are made…

Q: Fill in the blanks. The subatomic particle _____________ lacks a charge and are located in…

A: Subatomic particles are neutron , proton and electron in which electron has -ve charge proton has…

Q: In the following drawing, the green spheres represent atoms of a certain element. The purple spheres…

A: In the given chemical change, the starting materials consist of four green spheres and two purple…

Q: 1 Elements ________ exhibit similar physical and chemical properties. Group of answer choices in…

A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: Silicon is essential to the computer industry as a major component of semiconductor chips.It has…

A: Isotopes are those atoms of an element, that have same atomic number and different mass number.…

Q: I am working on question 25 of chapter 2 in the chemistry openstax second edition.  The question is…

A: The equation is correct. In the equation x is the fraction of isotope with atomic mass 10.0129 amu…

Q: How are the elements in the periodic table arranged based on their increasing atomic number? AVOID…

A: The term atomic number can be described as the no. of protons which a nucleus is having in an atom.…

Q: Hydrogen atoms have 1 electron and a mass of 1. How many protons are in hydrogen atoms? When…

A: In a neutral atom, the number of electrons and protons is the same. Hence, we can say that: Number…

Q: In dating geological samples, scientist compare the ration rubidium-87 to strontium-87. Give the…

A: The atomic number is the number of protons in the nucleus of an atom. In an electrically neutral…

Q: (a) How many protons are found in one atom of selenium-80? protons (b) How many neutrons are found…

A:

Q: Part A Na Na + Express your answer as a particle or a chemical formula. ΑΣφ ? OA chemical reaction…

A:

Q: An element from the Periodic Table is shown below. The atomic mass is given. A) Give the Name,…

A: The answer is given as follows

Q: Antimony (Sb), has two naturally occurring isotopes: Sb-121 that has a percent abundance of 57.30 %…

A: Given: Antimony (Sb) has two isotopes Sb-121 and Sb-123 Mass of Sb-121 =120.90 amu Percentage…

Q: how many protons and neutrons are in 37Cl?

A: The answer to the following question is given as -

Q: A 0.383 g sample of an element contains 1.943 × 10 21  atoms. What is the element symbol

A: Given, amount of sample =0.383 gnumber of atoms of the sample =1.943×1021 atomswe are asked to…

Q: Use the Periodic Table to help you answer the following questions

A: Carbon has an atomic symbol of C and belongs to group 14 and second period.

Q: Antinomy, Sb, has 2 isotopes and an atomic weight of 121.75 amu. The isotope anitimony-121 has a…

A:

Q: 86. the symbol for the atomic number is Z the United States has the largest water footprint of…

A: Given:  Q 86 to 95 for True or False Q 96 to 100 for Matching

Q: Magnesium constitutes about 2% of Earth’s crust and has three naturally occurring isotopes. Suppose…

A:

Q: Complete the first row of the table with the number of protons, neutrons, and electrons for 28Si.

A: Complete the first row of the table with the number of protons, neutrons, and electrons for 28Si.

Q: Antimony (Sb), has two naturally occurring isotopes: Sb-121 that has a percent abundance of 57.30 %…

A:

Q: You are exploring the universe in your spaceship, and you land on a planet that is very similar to…

A:

Q: ow many protons does aluminum (Al) have? How many neutrons? How many electrons?

A: Aluminium  atomic number = 13  Electronic  configuration  of aluminium = 1s22s22p63s23p1

Q: The atomic theory states that all matter is made of atoms. These atoms are made of subatomic…

A: Matter is made up of atoms.  Atom contains particles like electron, proton and neutron. Proton and…

Q: In any neutral Adam there are equal numbers of? A. Neutrons and electrons B. Protons and neutrons…

A: Neutral atom are those having not any charge. They are wholely neutral

Q: Here is a list of statements. Put a check mark for the accurate ones and the necessary corrections…

A: Matters are the particles which consists mass and volume. Matter is not able to be seen by naked…

Q: i have 16 protons  16 neutrons and 18 electons  what would a sketch look like?

A: Since number of protons = atomic number in case of ions Hence the atomic number of the above atom is…

Q: . In the following figures, the open circles represent atoms of an element and the filled circles…

A: Dalton’s Atomic Theory: Dalton's Atomic Theory is based on law of conservation of mass and the law…

Q: Boron occurs naturally as 10B and 11B. Which isotope is most abundant? (Refer to the Periodic…

A: The isotopes can be described as the types of the species which have equivalent atomic number…

Q: true or false (h)  All atoms of the same element have the same number of electrons.  (b) All atoms…

A: h) All atoms of the same element have the same number of electrons. The given statement is False.…

Q: At some point in the future, nuclear chemists have synthesized two stable isotopes of bohrium.…

A: Since average mass of the element is given so we can easily calculate the fraction of each isotope…

Q: Timmy: Titanium has an atomic number of 22, which means it has 22 protons.  The average mass is…

A: For Titanium  atomic number = 22 number of protons = 22 average mass number =number of protons…

Q: Use the atomic mass of europium to find the mass of Eu-153. Find the natural abundance of Eu-153.

A: Since the average mass of europium=151.964 g And mass of isotope Eu-153 = 153 g

Q: Discovering which of the three subatomic particles proved to be the most difficult—the proton,…

A: From three subatomic particle - the proton, neutron and electrons : Answer :            The NEUTRON…

Q: If you wanted to make an accurate scale model of the hydro- gen atom and decided that the nucleus…

A: No, the end result will not be much smaller than 106 mm. This is because it is an hypothetical model…

Q: Q. An element has three naturally occurring isotopes with the following masses and abundances:…

A: The isotope of an element is the substance with the same number of protons with a different number…

Q: Oxygen, whose atomic number is eight, has three stable isotopes: 16O, 17O, and 18O. Explain what…

A:

Q: The two naturally occurring isotopes of antimony are ¹2¹ Sb and 123Sb whose exact isotopic masses…

A: Given: Average atomic mass of Sb = 121.8 amu Isotopic mass of 121Sb = 120.904 amu Isotopic mass of…

Q: An atom has a diameter of 1.50 Å and the nucleus of that atom has a diameter of 3.00×10−5 Å.…

A:

Q: An unknown element is determined to have two naturally occurring isotopes. Isotope 1 is 68.11%…

A: Given,Isotope 1 is 68.11% abundant and has a mass of 68.925580 amu, and isotope 2 has a mass of…

Q: The synthetic radioactive element gallium is used in many medical studies. Give the number of…

A: Gallium-67 has 31 electrons, 31 protons and 36 neutrons.

Q: The cation 119Sn+4  has how many electrons, neutrons, and protons

A: tin atom has 50 protons, 69 neutrons and 48 electrons. but it is Sn+4 ion so it  loose four…

Q: Complete the following information. If necessary, use the periodic table. Nuclear symbol =  Charge =…

A: Number of protons in an atom serves as identity of an element. number of protons in the nucleus is…

Q: Silver has two naturally occurring isotopes: Ag-107 and Ag-109. The Ag-107 isotopes has a percent…

A: Given: The atomic mass of Ag-107 =106.905 amu The percent abundance of Ag-107 =51.84 % The atomic…

Q: Nitrogen (N), has two naturally occurring isotopes: N-14 that has a percent abundance of 99.63 % and…

A: The atomic mass of Nitrogen = ( mass of N-14 X percent of N-14 + mass of N-15 X percent of N-15) /…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.