revision mind map KA1
name of group 1 elements
alkali metals
name of group 7 elements
halogens
are group 1 reactive? why?
very reactive (with air) because the outer electron has a weaker attraction to the nucleus
explain why group 7 elements have similiar chemical properties?
because all halogens have 7 electrons in their outer shell
explain why group 0/8 elements have similar chemical properties?
they have the same number of electrons in their outer shell
describe how reactivity changes as you go down group 1
reactivity increases
explain why group 7 elements gain an electron?
atoms are always trying to gain a full outer shell and halogens have 7 so they need 1 more to be stable
are group 8 elements reactive or unreactive? why?
unreactive because they dont need to join to other atoms/ they have a fuller outer shell
explain why group 1 elements have similar chemical properties?
theh all have 1 electron in their outer shell, so theyll all have similiar reactions
explain why group 1 metals lose an electron?
the attraction between nucleus and outer electron gets weaker - so an electron is more easily lost. they do this to become more chemically stable.
name of group 8/0 elements
noble gases
define element
a substance made from one type of atom only.
define an atom
tiny particles called atoms, they contain protons, neutrons and electrons
define a compound
a substance made up of two or more different chemical elements
how to calculate mass no. of an element
mass=sum of protons + neutrons in nucleus
how to calculate the no. neutrons
neutrons= mass-protons
why is an atom neutral
the opposite charges of protons and electrons cancel eachover out. making it neutral.
what does the atomic number tell us?
how many protons the atom contains
what charge is the nucleus of an atom?
positively charged as it contains the protons.
nucleotide notation for sodium? (mass no. 23)
23
Na
11
label the nucleotide notation of an atom
23 -> mass number
Na -> element symbol
11 -> atomic number
how many electrons are able to go in the 1st, 2nd, 3rd shell?
1st: 2
2nd: 8
3rd: 18
mass and charge of proton
mass-1
charge-1
mass and charge of electron
mass- -1
charge- -1
mass and charge of neutron
mass-1
charge-0