topic 1

Question 1

mass of an electron

Answer 1

1/1840

Question 2

atomic number

Answer 2

The number of protons in an atom of an element

Question 3

mass number

Answer 3

the total number of protons and neutrons in an atom of that element.

Question 4

isotope definiton

Answer 4

atoms of the same element but with different number of neutrons but same number of protons.

Question 5

relative isotopic mass

Answer 5

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

Question 6

relative isotopic mass

Answer 6

the weighted mean mass of an atom of an element compared with 1/12 or mass of carbon-12

Question 7

first ionisation energy

Answer 7

The energy required to remove one mole of electrons from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.
X(g) X+(g) + e-

Question 8

suessive ionisation enrgy

Answer 8

idk

Question 9

orbital

Answer 9

a region within an atom that can hold up to two electrons with opposite spins