Atoms and Isotopes Review

Which of these determines the identity of an atom?

• proton

• neutron

• valence electron

• protons and neutrons

How do you determine how many Neutrons an atom has?

• Protons + Valence Electrons

• Atomic Mass - Atomic Number

• Atomic Mass + Atomic Number

• Protons + Electrons

_______ are atoms with the same number of protons but varying numbers of neutrons.

• ions

• elements

• allotropes

• isotopes

Tags

NGSS.MS-PS1-1

What is the atomic number for an element with three protons?

• 2
• 1
• 3
• 6

What is the mass number?

• The average atomic mass
• the number of protons and neutrons in the nucleus
• the number of protons in the nucleus
• the number of protons and electrons in the nucleus

An isotope of Carbon has 7 neutrons, what is its mass number?

• 7
• 6
• 13
• 1

Most of the mass of an atom is contained in the ____?

• nucleus
• electron cloud

Tags

NGSS.HS-PS1-7

What is the atomic number of Fe? (click to see image)

• 26
• 55.845
• 56
• None of these

Tags

NGSS.MS-PS1-1

What do these isotopes of carbon all have in common?

• neutrons and mass number

• atomic number and neutrons

• atomic number and electrons

• atomic number, neutrons and mass number

Tags

NGSS.MS-PS1-1

How many neutrons does the isotope of Lithium have?

• 8

• 4

• 3

• 5

Tags

NGSS.MS-PS1-1