atomic structure

Question 1

define atomic number

Answer 1

number of protons in the nucleus of an atom

Question 2

define mass number

Answer 2

number of protons plus neutrons in an atom

Question 3

define isotope

Answer 3

atoms of the same element which have the same number of protons in the nucleus but different number of neutrons.

Question 4

define relative isotopic mass

Answer 4

mass of one atom of an isotope relative to 1/12 of the mass of an atom of the isotope carbon - 12

Question 5

define relative atomic mass

Answer 5

the average mass of an isotope of an element relative to 1/12 the mass of an atom of the isotope carbon-12

Question 6

relative mass of an electron

Answer 6

very small
NOT zero