Atomic Composition & Isotope Abundance (lesson 4)

Question 1

Valance Electron

Answer 1

electrons outermost shell

Question 2

Electron Pairs

Answer 2

two electrons that are interacting in a unique way therefore they are situated close together

Question 3

Unpaired Electrons

Answer 3

electrons in unfilled outer shell that are not a pair therefore they are more likely to be involved in chemical bonds with other atoms

Question 4

Isotopes

Answer 4

atoms of the same element that have the same number of protons and different numbers of neutrons

Question 5

Ions

Answer 5

atoms with a positive or negative charge

Question 6

Radioisotopes

Answer 6

atoms with unstable nuclei that often decay into stable isotopes

Question 7

Atomic Mass Unit

Answer 7

1/12 of mass carb-12 atom

Question 8

Isotope Abundance

Answer 8

The amount of a given isotope of an element that exists in nature that is expressed as a percentage of the total element amount

Question 9

Subatomic Particle

Answer 9

a particle that is smaller than an atom

Question 10

Who determined that nuclei was comprised of multiple particles?

Answer 10

Rutherford

Question 11

What causes radioisotopes?

Answer 11

unbalance in number of protons and neutrons so atom releases energy to try to stabilize itself bc of extra neutrons

Question 12

Relative Atomic Mass

Answer 12

mass of all other atoms