TABLE 2.3 Names of Some Groups in the Periodic Table Name Group Elements Li, Na, K, Rb, Cs, Fr Be, Mg, Ca, Sr, Ba, Ra O, S, Se, Te, Po Alkali metals Alkaline earth metals Chalcogens Halogens Noble gases 1A 2A 6A F, CI, Br, I, At He, Ne, Ar, Kr, Xe, Rn 7A 8A

Q: In Example 2-1, we established that the mass ratio of magnesium to magnesium oxide is 0.455 g…

A: We have been provided with the ratio of magnesium to its oxide. Let us calculate other required…

Q: What THREE elements are rare-earth elements? calcium neodymium rhenium niobium samarium thallium…

A: In the above question the elements which are rare earth metal  among the option provided are…

Q: 4. How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass…

A: An atom's mass number tells you the total number of protons and of neutrons that atom has in its…

Q: Neon-22 contains 12 neutrons. It also contains a. 12 protons. b. 10 protons. c. 22 protons. d.…

A: Neon-22 means 22Ne10 where 22 represents the atomic mass of Neon and, 10 is atomic number of Neon

Q: How many neutrons, protons, and electrons does126 52Te have?A. 126 neutrons, 52 protons, and 52…

A: Interpretation - To find number of neutrons, protons and electrons in Te52126.

Q: Fill in the table with the appropriate number of protons (p") and neutrons (n°) element p no K-32…

A: The atomic number of an atom is the number of protons present in the atom. For a neutral atom, the…

Q: 2. Bromine has two naturally occurring isotopes (Br-79 and Br-81) If the natural abundance of Br-79…

A:

Q: Bromine has two naturally-occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of…

A: Given : Atomic mass of Br = 79.9 amu  Mass of isotope 79Br = 78.9 amu Abundance of 79Br = 50.3 % And…

Q: What is the radius (in cm) of a pure copper sphere that contains 1.27*1-^24 copper atoms?  The…

A:

Q: MCQ 20: The number of atoms in the same element has the same number of A. protons B. electrons C.…

A: ATOM The atom is the smallest unit of a chemical element and is the basic unit of matter which…

Q: Which elements are in the same group helium and hydrogen carbon and oxygen sodium and magnesium…

A: Group: The vertical column of the modern periodic table is known as "Group".

Q: How many protons, neutrons, and electrons are in the followingatoms? (a) 40Ar, (b) 65Zn, (c) 70Ga,…

A: (A) 40Ar= protons- 18, neutrons- 22, electrons- 18 (B) 65Zn= protons- 30, neutrons- 35, electrons-…

Q: 2-81. (*) A 40.0-milligrams sample of the compound X.O, contains 22.5 milligrams of oxygen atoms.…

A: We have a 40 mg of sample  of X4O10, which contain 22.5 mg of oxygen atoms,  We have to calculate…

Q: How many protons (p), neutrons (n), and electrons (e) are in one atom of  23  12   Mg  ? (*23 is the…

A: Mg is an Alkaline Earth Metal (Group 2) element. Atomic No. of Mg = 12 Mass No. of Mg = 23

Q: 1. Atomic Structure. 106 a) 46 Pd*2 b) 232 92 U

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Q: Rubidium has an atomic number of 37 and a mass number of 85. How many protons, neutrons, and…

A: Given  Rubidium  has an atomic number of 37and mass number of 85  and  carry  1+ charge.we need to…

Q: The ratio of sulfur to oxygen by mass in SO2 is 1.0:1.0. Find the ratio of sulfur to oxygen by mass…

A: Molar mass of sulphur = 32 g/mol Molar mass of Oxygen = 32 g/mol

Q: 49.31%. What is the relative atomic mass of Br? 2.9. An isotope of lead has an isotopic mass of 208.…

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Q: Magnesium has an atomic number of 12. Which of the following statements is true of a neutral…

A: Correct answer is (a.) It has 12 protons, 12 electrons, and 12 neutrons. Atomic number (Z) = number…

Q: Fill in the blanks in the chart below with the symbol, mass number, number of protons, neutrons and…

A: The chart below shows the symbol, mass number, number of protons, neutrons and electrons and charge.

Q: Compare the elements Mg, N, O, Be with regard to the following properties: You may need to use the…

A: The elements given are Mg, O, N and Be.

Q: What element is “X" give the chemical symbol? а.) X 1s°2s°2p® b.) X²+ 1s°2s°2p°3s°3p®

A: We have to identify  the  element 'X' for the  given two electronic configurations.

Q: The numbers of protons, neutrons, and electrons in the 23 Na isotope, respectively, are: 11 اختر…

A:

Q: How many protons, neutrons, and electrons are in 119Sn2+? a. 50 p, 69 n, 48 e- b. 50 p, 69 n, 50 e-…

A: The number of electrons, protons, neutrons found in 119Sn2+ has to be determined.

Q: Give the formula and charge of each of  the following cations: magnesium, zinc, iron(ili),…

A: Elements or molecules which loses its valence electrons are able to form a cation which is a +vely…

Q: How many protons, neutrons, and electrons are in a 37Cl-

A: Answer :  option (1) Cl atomic number (Z) = 17 , hence in an element atomic number (Z).          =…

Q: Consider a hypothetical case in which the charge on a proton is twice that of an electron. Using…

A: Answer: Potassium-39 means, its mass number is 39. Also neutron is always a neutral particle.

Q: Calculate the mass of a gold-197 atom using the information from question 9 and the masses of the…

A: The ratio of mass to the volume of the solution is known as density.

Q: Based on the information gathered from the periodic table seen in Figure 2-H, Magnesium will most…

A: 1) magnesium has an atomic number of 12 which means that it has 12 electrons and 2 electrons in the…

Q: A. IDENTIFICATION. Identify the word being described in the given 1. It is any subatomic particle…

A: Ans  1 - protons and neutrons 2- Z 3- Isotopes 4- Atoms 5- elections 6- niles bohr 7- John Dalton 8-…

Q: There are protons, neutrons, and electrons in 147₁ Hs+5

A: Atom is composed of three subatomic particles, which are electrons, protons and neutrons.  Protons :…

Q: (1) The radioactive isotope selenium-75 is used in medical imaging as indicated on the table above.…

A: Dear student since you have asked two different questions but according to guidelines we will solve…

Q: Imagine you start with an atom that has 7 protons, 7 neutrons, and 7 electrons. If you add 1 proton…

A: According to question initially we had;no of protons= 7no of neutrons= 7no of electrons=7When, 1…

Q: How many protons and neutrons are in an atom of Th-229 ? Number of protons= ________ Number of…

A:

Q: 62 26 Fe 2+ 3. Which best represents the isotope shown above? (A) 28 protons, 26 electrons, and 34…

A: Given   Element Fe (iron) atomic number of Fe = 26  mass number of Fe = 62  We know that  atomic…

Q: C. Isotopes or Different Elements? Use the information given below to determine if the pair of…

A: Isotopes :Atoms of the same element which the same atomic number but differentmass number are called…

Q: Which is the explanation for the difference between the two isotopes of carbon, C-12 and C-14? a.…

A: Concept: Isotopes are the element of the same species that have the same atomic number but differ in…

Q: 2. How many protons, electrons, and neutrons do the three isotopes of hydrogen have? (Protium,…

A: Fill the table---

Q: 4/2He+2has how many protons, neutrons, and electrons?

A: Consider the relation between atomic number, number of protons and number electrons in the neutral…

Q: 8, How many protons, electrons, and neutrons (respectively) are in an atom of iodine-131?…

A:

Q: 1. Sulfur is a bright yellow solid at room temperature. It is one of the components in gunpowder,…

A: Since you have posted question with multiple sub-parts, we are entitled to answer the first 3 only.

Q: Subatomic particle Neutron Proton Electron Charge Nitrogen Oxygen Fluorine Sodium Magnesium Mass…

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Q: 12. What is the charge of an atom with 10 electrons,12 protons,and 12 neutrons? A. 2 B.10 C.12…

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Q: MCQ 32: The atom of aluminum (Al) has the number of neutrons (n") A. 13 В. 27 C. 14 D. 13

A: Given the atom of aluminum (Al) we are asked to calculate the number of neutrons in aluminum atom.

Q: 2. What is the charge of an atom's nucleus? a. positive b. no charge c. negative d. can be positive…

A:

Q: In the periodic table, do the chemical properties change more than through a period or through a…

A: Periodic table is table in which the elements are arranged based on there electronic configurations.…

Q: 62 26FE2+ 3. Which best represents the isotope shown above? (A) 28 protons, 26 electrons, and 34…

A: For an ion given , Number of protons = Atomic Number Mass Number = sum of protons + neutrons. Number…

Q: "Atom X" has 7 protons, 8 neutrons, and 7 electrons "Atom Y" has 8 protons, 7 neutrons, and 8…

A: Given : For atom X  : number of Protons = 7 , neutrons = 8 , electrons = 7 For atom Y : number of…

Q: Two isotope of chlorine are found in nature, Cl-35 and Cl-37. The average mass or atomic weight of…

A: Isotopes are elements with similar atomic number but different mass numbers

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.