[SEC 3] CHAPTER 3 - atomic structure

Question 1

what is the relative mass of an electron?

Answer 1

1/1840

Question 2

define ‘isotopes’

Answer 2

isotopes are atoms of the same element with the same number of protons and electrons but different number of neutrons

Question 3

define ‘ion’

Answer 3

an ion is the particle formed when an atom or group of atoms gains or loses electron(s), but the number of protons and neutrons (in the nuclues) remains the same

Question 4

what is a noble gas?

Answer 4

a noble gas is when the valence electron shell of a particle is fully-filled. when they have a fully-filled valence electron shell, they have attainned a stable noble gas electronic configuration

stable: chemically unreactive