Question 1

Which of the following correctly describes the charge and location of each subatomic particle in an atom?

Accepted Answer

Protons: positive, nucleus; Neutrons: neutral, nucleus; Electrons: negative, electron cloud

Question 2

A neutral atom of sodium ($$^{23}\mathrm{Na}) $$has 11 protons. How many electrons and neutrons does it have?

Accepted Answer

11 electrons, 12 neutrons

Question 3

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

Accepted Answer

Electron

Question 4

If an atom loses one electron, what is the resulting charge of the atom?

Accepted Answer

$$+1$$

Question 5

Which statement best explains why isotopes of the same element have different masses but similar chemical properties?

Accepted Answer

They have different numbers of neutrons but the same number of electrons.

Question 6

Which of the following best describes the location of electrons in an atom?

Accepted Answer

Electrons are found in electron clouds surrounding the nucleus.

Question 7

A carbon atom has 6 protons, 6 neutrons, and 6 electrons. If it gains two neutrons, what is the new mass number?

Accepted Answer

$$14$$

Question 8

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 9

A certain atom has 17 protons, 18 neutrons, and 17 electrons. What is its atomic number and mass number?

Accepted Answer

Atomic number: $$17$$, Mass number: $$35$$

Question 10

Which of the following statements is true regarding the charges of subatomic particles?

Accepted Answer

Protons and electrons have equal but opposite charges.

Question 11

In a hospital, a radioactive isotope is used for imaging. The isotope has the same number of protons as a stable atom but more neutrons. What property of the atom is changed by the extra neutrons?

Accepted Answer

Its mass number

Question 12

Which of the following best explains why atoms are electrically neutral?

Accepted Answer

They have equal numbers of protons and electrons.

Question 13

A fluorine atom has 9 protons and 10 neutrons. What is its mass number?

Accepted Answer

$$19$$

Question 14

Which subatomic particle is most responsible for the stability of the nucleus?

Accepted Answer

Neutron

Question 15

If an atom has 15 protons, 16 neutrons, and 18 electrons, what is its overall charge?

Accepted Answer

$$-3$$

Atomic Structure: Subatomic Particles Guidance

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