Atomic Structure and Isotopes Quiz

An unknown atom has 15 protons, 16 neutrons, and 15 electrons. What is its atomic number (Z) and mass number (A)?

• Z = 15, A = 15

• Z = 31, A = 15

• Z = 15, A = 31

• Z = 16, A = 31

An atom of Chlorine-35 has a mass number of 35 and an atomic number of 17. If it becomes a chloride ion (Cl−), how many electrons will it have?

• 17

• 16

• 18

• 35

An unknown element has an electronic configuration of 2, 8, 4. Based on this, how many protons does it have, and which element is it?

• 14 protons, Silicon (Si)

• 12 protons, Magnesium (Mg)

• 4 protons, Beryllium (Be)

• 14 protons, Carbon (C)

What is the key difference between an isotope's chemical and physical properties?

• Their physical properties are the same, but their chemical properties are different due to varying mass numbers.

• Their chemical properties are the same because they have the same number of protons, but their physical properties are different.

• Both their chemical and physical properties are the same because they are atoms of the same element.

• Both their chemical and physical properties are different because they have different numbers of neutrons.

A neutral atom of an element has 28 electrons. What is the correct nuclear notation for this element if it has a mass number of 62?

• 2862​Ni

• 6228​Ni

• 2834​Ni

• 3462​Ni

An ion has a charge of 3+ and an electronic configuration of [2, 8]. Which element is this ion derived from?

• Magnesium (Mg)

• Aluminium (Al)

• Lithium (Li)

• Nitrogen (N)

Which of the following statements correctly describes the composition and location of subatomic particles?

• Protons and electrons are in the nucleus, while neutrons orbit in shells.

• Protons, neutrons, and electrons are all located within the nucleus.

• Protons and neutrons are in the nucleus, and electrons orbit the nucleus in shells.

• Protons and neutrons orbit the nucleus, while electrons are in the nucleus.

An atom of Fluorine has a mass number of 19 and an atomic number of 9. How many neutrons does this atom have?

• 19

• 9

• 10

• 28

An ion with a 2- charge has 10 electrons. How many protons does this ion have, and what is its correct electronic configuration?

• 8 protons, electronic configuration is 2, 8

• 12 protons, electronic configuration is 2, 8

• 8 protons, electronic configuration is 2, 6

• 10 protons, electronic configuration is 2, 8

What is the relative atomic mass (Ar) of an element with two isotopes, one with a relative isotopic mass of 6 and an abundance of 92.5%, and the other with a relative isotopic mass of 7 and an abundance of 7.5%?

• 6.5

• 6.075

• 6.75

• 6.925