Module 2.1.1 atomic structure, ions, isotopes, formulae

Question 1

what is the relative mass and charge of a proton

Answer 1

mass - 1
charge - +1

Question 2

what is the relative mass and charge of a electron

Answer 2

mass - 1/2000 (negligible)
charge - -1

Question 3

what is the relative mass and charge of a neutron

Answer 3

mass - 1
charge - 0

Question 4

what does the atomic number mean

Answer 4

the number of protons in an atom

Question 5

what does the mass number mean

Answer 5

the number of protons and neutrons in an atom

Question 6

what charge does an atom have

Answer 6

atoms are neutral / they have no charge - meaning that they have an equal number of protons and electrons.

Question 7

what is an isotope

Answer 7

when atoms of the same element have the same number of protons (same atomic number) but different number of neutrons (different mass number)

Question 8

what are the properties of an isotope

Answer 8

Isotopes have the same chemical properties as they have the same number of electrons in their outer shell.

Question 9

how do ions form

Answer 9

when an atom gains or loses electrons, it becomes a charged particle (ion).

Question 10

what is meant by the relative atomic mass (Ar)

Answer 10

the average mass of an atom relative to the 1/12th of 12C

Question 11

what is relative atomic mass measured in

Answer 11

amu (atomic mass unit)

Question 12

what is meant by the relative isotopic mass

Answer 12

the average mass of an isotope compared to 1/12th the mass of a 12C atom

Question 13

how do you calculate the relative atomic mass (Ar)

Answer 13

[ (Abundance X Isotopic mass) + (Abundance X Isotopic mass) ] / (total abundance)