Question 1

Which of the following statements best describes the structure of an atom as depicted in the Bohr model?

Accepted Answer

Electrons orbit the nucleus in defined energy levels, with protons and neutrons located in the nucleus.

Question 2

Given the atomic number ($$Z) of an $$element is 6 and its mass number ($$A) is 14$$, how many neutrons does the atom have?

Accepted Answer

$$A - Z = 14 - 6 = 8$$ neutrons

Question 3

Which subatomic particle is responsible for the chemical properties of an element?

Accepted Answer

Electrons

Question 4

If an atom has 11 protons, 12 neutrons, and 10 electrons, what is its net charge?

Accepted Answer

+1

Question 5

Which of the following best explains why isotopes of the same element have different mass numbers?

Accepted Answer

They have different numbers of neutrons.

Question 6

A neutral atom of sodium ($$Na) $$has an atomic number of 11. How many electrons does it have?

Accepted Answer

11

Question 7

Which of the following is the correct formula to calculate the number of neutrons in an atom?

Accepted Answer

$$\mathrm{Number\ of\ neutrons} = A - Z$$

Question 8

Which of the following best describes the role of protons in the identity of an element?

Accepted Answer

Protons determine the atomic number and thus the identity of the element.

Question 9

An atom of carbon-14 ($$^{14}C) $$has 6 protons. How many neutrons does it have?

Accepted Answer

8

Question 10

Which of the following scenarios would result in the formation of a cation?

Accepted Answer

An atom loses one or more electrons.

Question 11

If an atom has an atomic number ($$Z) of 17 $$and a mass number ($$A) of 35$$, what is the number of neutrons?

Accepted Answer

$$A - Z = 35 - 17 = 18$$

Question 12

Which of the following best describes the difference between a neutral atom and an ion?

Accepted Answer

A neutral atom has equal numbers of protons and electrons, while an ion has unequal numbers.

Question 13

Which of the following is true about the mass number ($$A) of an $$atom?

Accepted Answer

It is the sum of protons and neutrons in the nucleus.

Question 14

A patient is diagnosed with anemia due to a mutation that changes the number of neutrons in iron atoms. What is the most likely effect of this mutation?

Accepted Answer

The mutation creates iron isotopes, which may affect the atom's stability but not its chemical properties.

Question 15

Which of the following best explains why the atomic number ($$Z) is $$always a whole number?

Accepted Answer

It represents the number of protons, which cannot be fractional.

Question 16

A scientist discovers a new element with 15 protons, 16 neutrons, and 15 electrons. What is its atomic number and mass number?

Accepted Answer

Atomic number: 15, Mass number: 31

Question 17

Which of the following is a correct statement about electrons in the Bohr model?

Accepted Answer

Electrons occupy specific energy levels around the nucleus.

Question 18

If an atom of chlorine ($$Cl) $$has 17 protons and 18 neutrons, what is its mass number?

Accepted Answer

$$A = 17 + 18 = 35$$

Question 19

Which of the following would result in the formation of an isotope?

Accepted Answer

Changing the number of neutrons in the atom.

Question 20

A hospital technician analyzes a blood sample and finds an atom with 20 protons, 20 neutrons, and 18 electrons. What is the charge and identity of the atom?

Accepted Answer

Charge: +2, Identity: Calcium ($$Ca)$$

Cell Structure and the Nucleus: Study Notes

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