Chemistry: atoms and the periodic table

It is the atomic number and it shows you the number of protons in the atom, this is also the number of electrons as they must be the same

In a cell in the periodic table what is the number on the bottom and what does it tell you?

Subtract the atomic number from the atomic mass

How do you find the number of neutrons?


What is the charge of a proton?


What is the charge of neutron?


What is the charge of a electron?

Isotopes are a different type of atom with the same number of protons and electrons, but a different number of neutrons

Define what an isotope is


How many electrons can fit in the first she'll?


How many electrons fit in the 2nd, 3rd, 4th etc shells?


What are the relative masses of protons and neutrons?


What is the relative mass of an electron?

You add an electron

What happens to the shells as you go across a period?

You add a shell

What happens to the shells as you go down a group?

9 atoms and four elements

How many atoms and elements are there in C2H5OH


What do you end the name of a compound with if it only has two elements?


What do you end the name of a compound with three elements and the third is oxygen?

copper sulfate

What is this compound in words: CuSO

No, it stays the same

Does mass change during a chemical reaction?

He was an English chemist who arranged the elements by atomic mass and noticed that properties repeated every 8th element. He did not produce the periodic table but he did make the table of octaves, the problem with his table was that he assumed all elements had already been found and the table only really worked until Cu (copper)

Who was John Newlands and what did he do?

He was a Russian chemist who arranged the elements by atomic mass but left gaps as he knew not all elements had been discovered. He also swapped some elements so that properties in a group were the same. Other scientists didn't really care until it helped them predict unknown elements and when it was proved to be true it was accepted.

Who was Demitri Mandelev and what did he do?

By their atomic number and all the elements in one group have to have the same number of electrons in the outer shell. Also the elements in the same group have similar properties

How are elements arranged now?

Reactive metals

What are groups 1 & 2?

Other metals (transition metals) and non-metals

What are groups 3,4,5 & 6?

They are good conductors of heat and electricity. They also have generally high melting points except for mercury. Also, they are shiny and have high melting points and densities

What are the physical properties of transition metals?

They are less reactive than group 1 metals

What are the chemical properties of transition metals?

They form coloured compounds

What happens when you form a compound with transition metals

They having low melting and boiling points, they have low densities and can be cut easily. Also, they are alkali metals and are very reactive, even with cold water

What are the properties of group 1 metals?