Atomic Theory and Structure

__________ determine the chemical reactivity of an atom.

• Protons

• Electrons

• Isotopes

• Neutrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An atom with the same atomic number but a different mass number is called

• an ion

• an isotope

• an element

__________ are used to identify the element.

• Electrons

• Periodic Table

• Protons

• Neutrons

If you change the number of neutrons, you change the __________.

• charge

• mass

• identity

The mass number of an isotope is equal to

• the number of protons.

• the number of protons minus the number of neutrons.

• the number of protons plus the number of neutrons.

• the number of neutrons.

How many protons are in Carbon-14?

• 6

• 8

• 14

• 12

An isotope of carbon contains 7 neutrons. What is it's mass number?

• 7

• 12

• 6

• 13

How many protons are in this element?

• 79

• 196

• 117

• Cannot be determined

Tags

NGSS.MS-PS1-1

protons + neutrons =

• atomic mass

• atomic number

• mass number

• atomic grass

The Modern Periodic Table of Elements is arranged by

• atomic mass

• atomic number

• valence electrons

• number of isotopes