b. Rutherford created the cathode-ray tube and was the lith Which of the following is(are) correct? a. 40C22+ contains 20 protons and 18 electrons. founder of the charge-to-mass ratio of an electron. c. An electron is heavier than a proton. d. The nucleus contains protons, neutrons, and electrons.

Q: Antimony (Sb) has two naturally occurring isotopes: Sb-121 that has a percent abundance of 57.21%…

A: Given: Isotope of Antimony (Sb)  % abundance  Sb-121.  57.21%.  Sb-123. 42.79%.

Q: Antimony has many uses, for example, in infrared devices and as part of an alloy in lead storage…

A: Isotopes are the chemical elements with same atomic number but different mass number. This implies…

Q: A sample of element Z has two naturally occurring isotopes.  The isotope Z-24 makes up 68.9% of the…

A: Interpretation: We have to calculate average atomic mass.

Q: Part C Rubidium has two naturally occurring isotopes: Rb-85 with mass 84.9118 amu and a natural…

A: Isotopes are the elements having same number of protons and differ in the number of neutrons, so the…

Q: A sample of an element has three isotopes: X with a mass of 18.321 amu and percent abundance of…

A: The average atomic mass of an element that has three isotopes is the fractional abundance of X times…

Q: Boron (BB)  has two naturally occurring isotopes: BB-10, which has a percent abundance of 19.88 %%…

A: The above mentioned question is explained below :

Q: An element has four naturally occurring isotopes with the masses and natural abundances given here.…

A: Given,

Q: 8) What kind of formular is C,H,O, consider as? A) Empirical formula B) Moleculr formula C)…

A: Protons and neutrons are present inside the nucleus and electrons are revolving around the nucleus…

Q: A natural sample of chromium, taken from the ground,will contain four isotopes: Cr-50, Cr-52, Cr-53,…

A: Chromium has four stable isotopes which are Cr-50, Cr-52, Cr-53, and Cr-54. Isotopes are the atoms…

Q: lectrons-Neutrons.pdf + 107% Element/ Atomic Mass Number Ion Number Atomic Mass Protons Neutrons…

A: The complete table for the above question is given below :

Q: Isn't 'O' the right answer for question Part A or am i wrong if so can someone please help with…

A: In the isotopic symbol of a nuclide, ZXA z indicates the atomic number which means the number of…

Q: If the cube with the same mass as part A is made of iron, determine the edge length of this cube (in…

A:

Q: Using this information along with the information in the table, calculate the % abundance and the…

A:

Q: [References] Americium-241 is an isotope of americium used in household smoke detectors. This…

A:

Q: e) A strange sample has 3 isotopes with abundances 1.4%, 24.1% and 74.5%. The atomic masses of the…

A: The average atomic mass of an atom is calculated by the formula: Avg atomic mass=∑Relative…

Q: How are isotopes of a particular element alike? How are they different?

A: Isotopes are atoms of the same element that have different numbers of neutrons but the same number…

Q: Two isotopes of boron occur naturally, with B at 19.90 % (10.01 amu) and B at 80.10 % (11.01 amu). ▼…

A: We knew that the avarage weight of any element is equal to avarage weights of all naturally…

Q: What is the atomic mass unit? a mass of a carbon atom b mass of a hydrogen molecule c (1/18) of…

A: What is the atomic mass unit?

Q: 1) a. Define mass number of an atom with examples. b.what is nucleus and electron of an atom?

A: Mass number is  the sum of the numbers of protons and neutrons present in the nucleus of an atom.

Q: You have an unknown element consisting of two Isotopes, one with mass 36.9659 amu (24.22%), and one…

A: Given data: Mass of isotope 1 = 36.9659 amu, Percentage abundance of isotope 1 = 24.22 %, Mass of…

Q: A hypothetical (fake) element has 2 naturally occurring isotopes. Isotope #1 has a mass of 185.8410…

A:

Q: Where are particles with virtually no mass found in the atom? A. The electron cloud B. Inside the…

A: Ans  A)  The electron cloud .

Q: In what way are isotopes of a given element always different? In what way(s) are they always the…

A:

Q: To the right is a representation of 50 atoms of a fictitious element called westmontium (Wt). The…

A: No. of atoms of each isotope are as follows: Wt-296 (red) 36 Wt-297 (blue) 2 Wt-298 (green)…

Q: A hypothetical element, X, has two isotopes: 47X with an isotopic mass of 47.621 amu and 51X with an…

A: The atomic mass of the element can be calculated as,

Q: 2. How would you describe the nucleus of an atom? A. dense, positively charged B. large, positively…

A: To describe : Nucleus of an atom.

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: The nucleus of an atom accounts for most of the size and mass of the atom. O very little of the size…

A: According to Dalton's atomic theory, compound is formed by combining elements and it's also based on…

Q: 9. What does the atomic number on the periodic table indicate about an atom of that element? A the…

A: Option A will be correct.

Q: Which of the following statement concerning the nucleus is NOT true? A) The density of a nucleus…

A: The nucleus is the positively charged center in an atom that contains protons and neutrons. The…

Q: Which idea came out of Rutherford’s gold foil experiment?a) Atoms contain protons and neutrons.b)…

A: Rutherford’s gold foil experiment is also called as Planetary model of the atom in which he told…

Q: Which pair of particles has the same number of electrons?

A: Total electrons in a cation = atomic number - total positive charge  Total electrons in an anion =…

Q: (a) Assuming the dimensions of the nucleus and atomshown in Figure 2.10, what fraction of the volume…

A: In order to find the fraction of the volume occupied we first write down the given data: From the…

Q: J.J Thomson determined the charge-to-mass ratio of the electron to be 1.759*1011 coulombs/kg. The…

A: We have to determineethe charge on the electron, C, in coulombs. Given, e/m = 1.759*1011…

Q: An American penny is 97.5% zinc and 2.5% copper and hasa mass of 2.5 g. Use the approximation that a…

A: Given, An American penny is 97.5% zinc and 2.5% copper and has a mass of 2.5 g. Use the…

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: What discoveries were made by J.J thompson and Lord rutherford? How did Daltons model of the atom…

A: J.J. Thomson experiment: - J. J. Thomson's cathode rays experiment leads to the conclusion that…

Q: er scientists knew that atoms contained charged subatomic pa the masses of the particles are…

A: using the mass data expressed in grams in the table calculate how many times more massive a proton…

Q: Assume element X has 2 isotopes: X-125 and X-126. For every 100 atoms of X, 30 of them have a mass…

A: Average atomic mass =mass of isotope X fraction abudance of isotope +mass of isotope -2X fraction of…

Q: Isotope Relative Isotope Mass Abundance 18HO 17.990 amu 78.920%, 20HO ? ?

A:

Q: 1. A solid circular cone made of pure platinum (d = 21.45 g/cm3 ) has a diameter  of 2.75 cm and…

A:

Q: The volume of a single tantalum atom is 1.20×10-23 cm³. What is the volume of a tantalum atom in…

A:

Atomic Structure

The basic structure of an atom is defined as the component-level of atomic structure of an atom. Precisely speaking an atom consists of three major subatomic particles which are protons, neutrons, and electrons. Many theories have been stated for explaining the structure of an atom.

Shape of the D Orbital

Shapes of orbitals are an approximate representation of boundaries in space for finding electrons occupied in that respective orbital. D orbitals are known to have a clover leaf shape or dumbbell inside where electrons can be found.