Chemistry Y10 T1

Question 1

definition of atom

Answer 1

The smallest particle of an element which shows the properties of the element

Question 2

defintion of molecule

Answer 2

Two or more atoms joined together by covalent bonds (sharing electrons). These have no charge.

Question 3

what are the subatomic particles

Answer 3

proton, neutron, electron

Question 4

where are protons and neutrons located

Answer 4

in the central nucleus

Question 5

where are electrons located

Answer 5

in electron shells, which orbit around the nucleus

Question 6

what is the charge of an atom

Answer 6

neutral, because there is an equal amount of protons and electrons in each atom

Question 7

what is the atomic mass of a proton

Answer 7

1

Question 8

what is the atomic mass of a neutron

Answer 8

1

Question 9

what is the atomic mass of an electron

Answer 9

1/1836 (negligible)

Question 10

definition of atomic number

Answer 10

The number of protons in an atom.

Question 11

definition of mass number

Answer 11

The number of protons and neutrons in an atom.

Question 12

definition of isotopes

Answer 12

Atoms of the same element (same number of protons) but with a different number of neutrons.

Question 13

relative atomic mass formula

Answer 13

(isotope abundance x isotope mass number)/isotope abundance

Question 14

what are the rows in the periodic table called?

Answer 14

periods

Question 15

what are the columns in the periodic table called?

Answer 15

groups

Question 16

elements in each period have what?

Answer 16

same number of electron shells

Question 17

elements in each group have what?

Answer 17

same number of valence electrons