Atoms and Isotopes Review

The nucleus is composed of what?

• Neutrons and Electrons

• Neutrons and Protons

• Protons and Electrons

Which part of an atom has the smallest mass?

• Proton

• Neutron

• Electron

• They are all the same

When two atoms of the same element have different masses, they are called ______, and have a different number of ______.

• Neutrons; Isotopes

• Isotopes; electrons

• Isotopes; Protons

• Isotopes; Neutrons

What charge does an atom have when it GAINS electrons?

• Positive

• Negative

• Neutral

How many electrons does this bromine atom have?

• 35

• 45

• 80

• 115

Tags

NGSS.MS-PS1-1

What two particles determine the mass number?

• Protons and electrons

• Electrons and neutrons

• Protons and neutrons

How many neutrons does this Neon atom have?

• 21

• 11

• 10

• 12

Tags

NGSS.MS-PS1-1

What is the atomic number of this element?

• 12

• 24

• 23

Tags

NGSS.MS-PS1-1

Two atoms of different elements will definitely have different numbers_____

• Nuclei
• Protons
• Neutrons
• Electrons

An ion forms when an atom gains or loses

• Protons
• Neutrons
• Electrons