2. atoms and elements

Question 1

atoms

Answer 1

small particles of matter that cannot be broken down further by chemical means

Question 2

element

Answer 2

substance containing only one type of atom

Question 3

compound

Answer 3

substance made of atoms of different elements bonded together

Question 4

mixture

Answer 4

substance containing different elements of compounds that are not chemically bonded together

Question 5

atomic number / proton number

Answer 5

no. of protons in the nucleus of an atom

Question 6

nucleon number/ mass number

Answer 6

total number of protons and neutrons in the nucleus

Question 7

period number (in the periodic table)

Answer 7

how many electron shells r occupied

Question 8

group number (in the periodic table)

Answer 8

number of outer shell electrons

Question 9

isotopes

Answer 9

atoms od the same element that have the same number of protons but different numbers of neutrons

Question 10

relative atomic mass (Ar)

Answer 10

is the average mass of its isotopes, compared to 1/12 the mass of an atom of carbon-12

Question 11

Ar =

Answer 11

(atomic mass of first isotope x % abundance) + (atomic mass of second isotope x % abundance)