atoms, ions, and isotopes

Adding or subtracting neutrons (charge = 0, mass = 1) makes the element change into an...

• ion
• mixture
• isotope
• neutral atom

Tags

NGSS.HS-PS1-8

The atomic number is equal to _.

• the number of protons and electrons
• the number of neutrons only
• the total number of protons and neutrons
• the number of protons neutrons and electrons

What is the charge on a lithium atom that looses 1 electron?

• +1
• 0
• -1
• -2

Tags

NGSS.HS-PS1-1

Helium (He atomic number 2) has 2 protons, 2 neutrons, and 2 electrons) is the He element shown above an atom, an element, or an isotope?

• atom
• cation  (+ ion)
• isotope
• anion (-)

Tags

NGSS.MS-PS1-1

The atomic mass is equal to _.

• the number of protons only
• the number of neutrons only
• the total number of protons and neutrons
• the number of protons, neutrons, and electrons.

What is the net charge on the element shown above? 
(Calcium - atomic number 20)

• cation +1 charge
• cation +2 charge
• anion -1 charge
• anion -2 charge

Tags

NGSS.HS-PS1-1

How many protons does this isotope of titanium have? Hint titanium has an atomic number of 22.

• 48
• 22
• 26
• 70

Tags

NGSS.MS-PS1-1

What element is this?  What is the mass number of this atom?

• sodium, 23
• magnesium, 23
• magnesium, 12
• sodium, 11

Tags

NGSS.MS-PS1-1

Which atom has  4 neutrons?

• Li-6
• Li-7
• Li-8
• they have the same # of neutrons

Tags

NGSS.MS-PS1-1

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

• 26
• 55.845
• 56
• None of these

Tags

NGSS.HS-PS1-1