Atoms, Ions, and Isotopes Practice

Given two atoms, Atom X with 11 protons, 12 neutrons, and 11 electrons, and Atom Y with 11 protons, 12 neutrons, and 10 electrons, which statement best compares Atom X and Atom Y?

• Atom X and Atom Y are isotopes of each other.

• Atom X and Atom Y are ions of the same element.

• Atom X and Atom Y are different elements.

• Atom X and Atom Y have different numbers of protons.

Tags

GA.SPS1.a

A neutral atom of chlorine has 17 protons and 18 neutrons. Which of the following represents an isotope of chlorine?

• 17 protons, 17 neutrons

• 18 protons, 17 neutrons

• 17 protons, 19 neutrons

• 18 protons, 18 neutrons

Tags

GA.SPS1.a

An atom has a mass number of 23 and an atomic number of 11. How many neutrons does it have?

• 11

• 12

• 23

• 34

Tags

GA.SPS1.a

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

• They have different numbers of protons.

• They have different numbers of neutrons.

• They have different numbers of electrons.

• They have different atomic numbers.

Tags

GA.SPS1.a

A magnesium ion has 12 protons, 12 neutrons, and 10 electrons. What is its charge and how does it compare to a neutral magnesium atom?

Tags

GA.SPS1.a

Which of the following pairs are isotopes of the same element?

Tags

GA.SPS1.a

A neutral atom of sulfur has 16 protons and 16 electrons. If it gains two electrons, what is the resulting ion’s charge and electron count?

Tags

GA.SPS1.a

• The sodium ion has more electrons than the sodium atom.

• The sodium atom and sodium ion have the same number of electrons.

• The sodium ion has fewer electrons than the sodium atom.

• The sodium ion has more protons than the sodium atom.

Tags

GA.SPS1.a

An atom of potassium has 19 protons, 20 neutrons, and 18 electrons. What is the symbol for this ion and what is its charge?

Tags

GA.SPS1.a

Which of the following best explains why ions form from neutral atoms?

• To change the number of protons in the nucleus

• To achieve a stable electron configuration

• To increase the number of neutrons

• To change the atomic number

Tags

GA.SPS1.a