Unit 1: Atoms & Elements

The proton is one kind of particle that makes up the atom and has a ___________ charge. The neutron has a neutral charge. The third kind of particle, an electron, has a ___________ charge and has almost no mass.

• Positive, positive

• Positive, negative

• Negative, negative

• Negative, positive

An atom that has lost or gained an electron is a

• ion

• isotope

• quark

Isotopes are atoms with the same atomic number but a different number

• protons

• electrons

• neutrons

Elements that have the same number of electrons in their valence shell:

• Contain similar amounts of energy

• Are in the same column on the periodic table

• Have the same number of isotopes

The number of neutrons is equal to

• Mass number – electrons

• Mass number – protons

• Mass number x protons

Atoms typically have a neutral charge overall, meaning

• They have the same number of protons & electrons.

• They have different numbers of protons & electrons.

• They have the same number of protons & neutrons.

The majority of the elements on the periodic table are reactive. Which group of element are non-reactive

• metals

• non metals

• Noble gases

A common isotope of carbon has a mass number of 14. What is the number of neutrons in this isotope?

• 6

• 8

• 12

Atoms with the same atomic number but different mass numbers are called?

• molecules

• ions

• isotopes

Find on the periodic table the element nitrogen (N). An atom of nitrogen has how many electrons?

• 7

• 8

• 14