chapter two

Question 1

atomic number

Answer 1

number of protons
never varies
if it changes it no longer the same element

Question 2

isotopes

Answer 2

the number of neutrons present in an element and they can vary
have diff masses yet still same element

Question 3

mass number

Answer 3

of protons and neutrons

Question 4

to fill valence shell

Answer 4

chemical bonds
covalent bond: polar (not shared equal)- nonpolar(shared equally)
Ionic bonds
van der waals interactions

Question 5

covalent bond

Answer 5

strong attraction where two atoms share one or more pairs of electrons
can be polar or non polar

Question 6

ionic bond

Answer 6

instead of sharing electrons they are transferred from one to the other giving both atoms a full outermost shell

Question 7

ion

Answer 7

an atom or molecule that carries a full charge rather than the partial charge that arise from polar covalent bonds

Question 8

cation

Answer 8

a positively charged ion

Question 9

anion

Answer 9

negatively charge ion

Question 10

van der waals interactions

Answer 10

occur between molecules or between portions of large molecules

Question 11

in a double covalent bond has

Answer 11

4 total electrons each atom shares 2 electrons

Question 12

in a triple covalent bond has

Answer 12

6 total shared electrons each atoms shares 3 electrons

Question 13

molecular formula

Answer 13

H2

Question 14

structural formula

Answer 14

h-h