Atomic Structure & Nuclear Chemistry

How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?

• 20
• 10
• 2
• 18

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?

• 34
• 36
• 2
• 40

Tags

NGSS.HS-PS1-1

What particle provided the positive charge for an atom?

• proton 
• neutron
• electron
• nucleus

Tags

NGSS.MS-PS1-1

How many protons are in this element?

• 79
• 196
• 117
• Cannot be determined

How many neutrons will an atom have it has an atomic number of 26, an atomic mass of 58 and a charge of +3?

• 26
• 58
• 32
• 3

The dense center region of an atom

• electron cloud
• core
• nucleus
• centrino

Tags

NGSS.HS-PS1-8

Subatomic particle that determines the identity of the atom

• proton
• nucleus
• electron
• neutron

An atom with an unequal number of protons and electrons is said to have (a) ___.

• no charge
• balance
• charge
• unbalance

Tags

NGSS.MS-PS1-1

How many electrons would an atom of Krypton have?

• 83.80
• 36
• 12
• none

Tags

NGSS.HS-PS1-1

In the isotope name, Hydrogen-3, what does the 3 represent?

• charge
• mass
• atomic number
• number of electrons