Atomic Structure

Question 1

protons - (electrical charge, location in atom & relative mass)

Answer 1

+
nucleus
1 amu or g/mole

Question 2

electrons - (electrical charge, location in atom & relative mass)

Answer 2

e-,
in cloud around nucleus
0; 1/2000 p & n

Question 3

neutrons (electrical charge, location in atom & relative mass)

Answer 3

0
nucleus
1 amu or g/mole

Question 4

subatomic particles

Answer 4

protons
electrons
neutrons

Question 5

of protons in an atom is determined by its…

Answer 5

atomic number

Question 6

of electrons in an atom is

Answer 6

same # of protons

Question 7

of neutrons in an atom is

Answer 7

atomic mass minus the # of protons

Question 8

nucleus of an atom is also known as…
& made up of

Answer 8

center of the atom
protons and neutrons

Question 9

atomic mass number

Answer 9

of protons + neutrons

Question 10

_ of VOLUME of the atom is taken up by e-
vs
_ of VOLUME is the nucleus

Answer 10

99.9% : 0.1%

Question 11

_ of the MASS is from e-
vs
_ of the MASS is from the nucleus

Answer 11

0.1% : 99.9%

Question 12

1 amu = _ grams

Answer 12

1.67 x 10^-24

Question 13

effect of adding or removing protons

Answer 13

new element w/ new properties

Question 14

effect of adding or removing electrons

Answer 14

same element, but becomes an ion

Question 15

effect of adding or removing neutrons

Answer 15

same element, diff mass & stability

Question 16

PT

Answer 16

recipe for representing 1 neutral atom of the most common isotope of any element

Question 17

atoms have neutral charge when

Answer 17

of protons = # of electrons

Question 18

atomic #

Answer 18

element identity

Question 19

average atomic mass

Answer 19

average of the masses of ALL the isotopes of the element

Question 20

mass of the most common isotope

Answer 20

round the av atomic mass decimal to nearest integer

Question 21

isotopes

Answer 21

same element (same # of protons) but diff versions (diff # of neutrons)

Question 22

in the Bohr model, the 1st energy level can hold up to

Answer 22

2 e-

Question 23

2nd energy level of atom (Bohr model) can hold up to

Answer 23

8 e-

Question 24

3rd energy level (bohr model) can hold up to

Answer 24

8 e-

Question 25

identity of an atom

Answer 25

element symbol

Question 26

av atomic mass for an element = _ x _ + _ x _

Answer 26

% abundance of isotope 1 (decimal form) x atomic mass of isotope 1 + % abundance of isotope 2 (decimal form) x atomic mass of isotope 2

Question 27

mass # & av atomic mass differences

Answer 27

mass #: for one atom, no decimals; 1's, rarely use av atomic mass: for a sample of atoms, use to the hundredth place, usually use

Question 28

mass # is where on the periodic table

Answer 28

top left corner of symbol

Question 29

atomic number is where on the periodic table

Answer 29

bottom left corner of symbol

Question 30

ion charge (+ or - or neutral) is where on the periodic table

Answer 30

top right corner of symbol

Question 31

when are gamma-rays (and x-rays) emitted

Answer 31

when the nucleus undergoes some other type of decay or just on their own