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

• 20
• 25
• 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

NGSS.HS-PS1-2

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

• 20
• 45
• 18
• 2

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

• 34
• 74
• 40
• 36

Tags

NGSS.MS-PS1-1

What particle provided the positive charge for an atom?

• proton 
• neutron
• electron
• nucleus

Which particle only contributes to the mass of an atom?

• Proton
• Neutron
• Electron
• Nucleus

Which particle does not contribute mass to the atom?

• Proton
• Neutron
• Electron
• Nucleus

Tags

NGSS.HS-PS1-7

Which particle contributes the negative charge to the atom?

• proton
• electron
• neutron
• nucleus

How many protons are in this element?

• 79
• 196
• 117
• Cannot be determined

What is the atomic mass (rounded to the nearest whole number) of this element

• 196
• 196.95
• 197
• 79

Tags

NGSS.HS-PS1-7