subatomic elements, isotopes, and isotopic notation

Question 1

what is law of conservation of mass

Answer 1

States that in a chemical reaction mass is neither created nor destroyed

Question 2

what is law of definite proportions

Answer 2

All samples of a given compound have the same proportions of the elements that make it up

Question 3

what is the charge of neutron

Answer 3

neutral

Question 4

what is the charge of electron

Answer 4

negative

Question 5

what is the charge of proton

Answer 5

positive

Question 6

which subatomic element is super small compared to the other two

Answer 6

electron

Question 7

Proton charge and electron charge are _____ in magnitude and _____ in sign.

Answer 7

equal, opposite

Question 8

where are protons located in the atom

Answer 8

the nucleus

Question 9

where are neutrons located in the atom

Answer 9

the nucleus

Question 10

what is the form for isotopic notation

Answer 10

A
X
z

Question 11

what is symbol for Atomic number

Answer 11

Z

Question 12

what is symbol for atomic mass

Answer 12

A

Question 13

atomic mass =

Answer 13

Atomic mass = Atomic number(aka # of protons) + number of neutrons
(A = Z + n) or (A = p + n)

Question 14

what number of subatomic particles is atomic number ALWAYS equal to

Answer 14

the protons

Question 15

where is atomic mass found on the periodic table

Answer 15

directly beneath the element’s symbol

Question 16

where is atomic number on periodic table

Answer 16

the upper left

Question 17

what purpose does atomic number serve

Answer 17

unique ID number for elements

Question 18

which never changes, atomic number or atomic mass

Answer 18

atomic number NEVER changes

Question 19

for which subatomic particle does the amount of never change

Answer 19

protons

Question 20

what subatomic particle can isotopes of an element vary in

Answer 20

neutrons; therefore, mass number changes

Question 21

isotope definition

Answer 21

elements that have the same number of protons and therefore the same atomic number, but a different number of neutrons which affects their mass number.

Question 22

how to calculate atomic mass

Answer 22

sum of (fraction of isotope n) x (mass of isotope n)

Question 23

what is natural abundance of isotopes

Answer 23

the measure of the average amount of a given isotope on Earth

Question 24

why do protons not change?

Answer 24

if the proton changes, the atomic number changes, therefore, the element will become a different element

Question 25

why is mass number different from weighted atomic mass number?

Answer 25

because weighted atomic mass # accounts for the natural abundance of isotopes, since isotopes have different masses, the weighted mass number is skewed by the mass number of the most abundant isotope