chemistry y9 Flashcards
what are all substances made up of
atoms
name 3 sub atomic particles in an atom
protons neutrons electrons
which sub atomic particles are found in the nucleus
protons neutrons
which subatomic particles are found in the shells around the nucleus
electrons
what is the mass of the subatomic particles
p=1
n=1
e=0(negligible)
what is the charge of the sub atomic particles
p=+1
n=0
e=-1
why do atoms have no overall charge
an atom has equal numbers of protons and electrons so the charges cancel each other out
why do elements in the same group react in the same way
they have the same number of electrons in the outer shell
what does the group number tell us
the number of electrons in the outermost shell
which side of the periodic table are metals found on
left
which side of the periodic table are non metals found on
right
what are the rows on the periodic table called
periods
what are the columns on the periodic table called
groups
lithium is in group 1 on the periodic table. How many electrons does it have on the outer shell
1
how many electrons are on the outer shell if its is in group 7
7
