atomic structure periodic tab Flashcards
how many atoms can you have in the first shell
2
what group are halogens
7
what group are noble gasses
0
what group are alkalies
1
what are isotopes
they have the same number of protons different number of neutrons
what is in the centre of the shell
nuncles
who discovered the neutron
James Chadwick
who created the plum pudding model
jj Thomson
What do electrons orbit on?
shell
mass of a proton
1
What is the mass of a electron?
0
What is an ion?
a charged atom that has lost or gained electrons
What is the defintion of an compound?
a substance made when two or more elements are chemically bonded together
How would you remove water from a mixture of a soluble solute and water
Evaporation
What is this a definition for: atoms of the same element which have the same number of protons and electrons but a different number of neutrons
isotopes
What is the defintion of an element?
a substance made up of only 1 type of atom. It cannot be broken down chemically into a simpler substance
What is the correct order for the development of the atomic model?
Dalton -Thomson-Rutherford- Bohr-(Chadwick)
chemical properties of group 7s
reactivity decreases going down the group, are highly reactive.
physical properties of group 7s
melting point increases going down the group,The colours of the halogens also change as you descend the group
physical properties of group 1 metals
brittle, soft, good, conductors, low melting point, shiny
what was the old periodic table arranged by
order of mass numbers
what was the modern periodic table arranged by
order of atomic number
how did madevel fix the problems of early periodic table
by leaving a dash
Definition of a molecule
a group of 2 or more atoms bonded together
Definition of an element
a substance made up of only one type of atom
what is the word equation of magnesium+oxygen
magnesium oxide
