Atomic Structure Test

Atoms of elements in the same group of the periodic table share the same

• number of energy levels

• number of valence electrons

• atomic numbers

• atomic masses

What is an atom’s nucleus made of?

• protons and electrons

• protons only

• protons and neutrons

• neutrons only

How many electrons will a neutral atom of carbon have if its nucleus has 6 protons and 8 neutrons?

• 2

• 6

• 8

• 14

Tags

NGSS.MS-PS1-1

An element with 5 protons, 6 neutrons, and 8 electrons has an atomic number of

• 5

• 6

• 8

• 11

Tags

NGSS.MS-PS1-1

An element with 5 protons, 6 neutrons, and 8 electrons has a mass number of

• 5

• 6

• 8

• 11

Atoms of the same element that have different numbers of neutrons are called

• molecules

• ions

• protons

• isotopes

Which particles determine the atomic number of an element?

• Protons only

• Neutrons only

• Neutrons and protons

• Protons and electrons

Two different isotopes of an element have different

• numbers of neutrons

• atomic numbers

• numbers of protons

• nothing is different about them

Two different isotopes of an element have the same

• numbers of neutrons

• mass numbers

• numbers of protons

• nothing is the same about them

The mass of the most common isotope of an element is known based on an element’s

• Mass number

• Atomic number

• Average atomic mass

• Number of electrons