Chemistry

Question 1

Atom

Answer 1

Everything is made of atoms

Question 2

“Father of atomic theory”

Answer 2

John Dalton
all matter made up of
hard spheres cant be broken into smaller
cant created or destroyed
element has own atom all identical

Question 3

Subatomic particles

Answer 3

relative mass relative charge
proton 1 1+
neutron 1 0
electron 1/1836 1-

Question 4

isotopes

Answer 4

atoms of same element with different number of neutrons
e.g chlorine

Question 5

Relative mass
RAF

Answer 5

(mass no. x %abundance)+(mass x % abundance) all divded by two

Question 6

Who created first periodic table and how was it ordered

Answer 6

Dmitri Mendeleev
rows-order of relative atomic mass smallest to highest
columns-similar chemical + physical propetries
left gaps
swapped Te + Iodine properties fitted better

Question 7

Modern Periodic table

Answer 7

arranged in Atomic numbers
rows=period(7)
columns=groups(8)
1-alkali metals
2-earth metals
2–3 transition metals
7-halogens
8-noble gases

Question 8

Electron shells

Answer 8

1st shell-2 electrons
2nd-8
3rd-8