# Atomic Nuclei Composition and Nuclear Concepts Quiz

SharperGnome
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## 18 Questions

X: 12, Y: 14

Isotopes

False

False

Atomic Nucleus

No

### What are the limitations of J.J. Thomson’s model of the atom?

Thomson's model couldn't explain the stability of an atom or the arrangement of electrons within it.

### What are the limitations of Rutherford’s model of the atom?

Rutherford's model failed to explain why electrons, with a negative charge, do not spiral into the positively charged nucleus.

### Describe Bohr’s model of the atom.

Bohr's model introduced the concept of quantized electron orbits around the nucleus, where electrons can only occupy certain fixed energy levels.

### What are the rules for writing the distribution of electrons in various shells for the first eighteen elements?

The first shell can hold up to 2 electrons, the second up to 8, and the third up to 8 as well.

### Explain with examples the concepts of (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars.

(i) The atomic number is the number of protons in an atom's nucleus. (ii) The mass number is the sum of protons and neutrons in an atom. (iii) Isotopes are atoms of the same element with different mass numbers. (iv) Isobars are atoms with the same mass number but different atomic numbers.

### Calculate the average atomic mass of a bromine atom given the isotopes 79 35 Br (49.7%) and 81 35 Br (50.3%).

The average atomic mass of bromine = (0.497 * 79 + 0.503 * 81) u.

### How do you find the valency of chlorine, sulphur, and magnesium?

Chlorine: 1, Sulphur: 2, Magnesium: 2

8

### Define atomic number and explain its significance.

Atomic number is the number of protons in the nucleus of an atom. It determines the identity of the element and is unique for each element.

### What is the mass number of an atom and what does it depend on?

The mass number is the sum of protons and neutrons in the nucleus. It depends on the composition of the nucleus.

### Explain why atoms of the same element have the same atomic number.

Atoms of the same element have the same number of protons, which determines the atomic number.

### How does the mass of an atom relate to the protons and neutrons in its nucleus?

The mass of an atom is primarily due to the protons and neutrons in its nucleus. Electrons contribute very little to the mass.

Test your knowledge on the composition of atomic nuclei, mass numbers, and nuclear concepts with this quiz. Explore the relationship between two atomic species X and Y based on their proton and neutron counts. Assess statements related to J.J. Thomson's model, neutron formation, electron mass, and nuclear concepts.

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