Isotopes and Their Uses

Atoms of the same element with different number of neutrons (and also mass) are called what?

• ions

• isotopes

• elements

• atoms

Protons have a _________ charge and neutrons have a ____________ charge.

• positive; negative

• positive; neutral

• neutral; positive

• negative; positive

A certain atom has 26 protons, 26 electrons and 30 neutrons. What is its mass number?

• 26

• 30

• 56

• 52

What does the atomic number tell you about an atom of a particular element?

• its number or electrons

• its mass

• its number or protons

• its number or protons and neutrons together

Which two parts of an atom have relatively the same mass?

• protons

• electrons

• neutrons

What is the unit of mass used with atoms?

• amu (atomic mass unit)

• grams

• mg

• ng

Where is most of the mass of an atom found?

• nucleus

• electrons

• rings around the atom

• protons

Tags

NGSS.HS-PS1-8

Which isotope of oxygen is the most abundant knowing that oxygen's average atomic mass is 15.999 amu?

• Oxygen-15

• Oxygen-16

• Oxygen-17

• Oxygen-18

All elements have several isotopes.

• True

• False

Tags

NGSS.HS-PS1-8

All isotopes are radioactive.

• True

• False

Tags

NGSS.HS-PS1-8