Chemistry GCSE (Y10/11)

In the nucleus of an atom there is _____ and _____

Protons Neutrons

What is the max amount of electrons in a shell going from 1-4?

2 8 8 2

In terms of elements, protons + neutrons = what number?

The large number a.k.a mass number

In terms of elements, the no. of protons or electrons = what number?

The small number a.k.a atomic number

What happens in the 1st stage of cell division?

The cell grows

Organelles duplicate

DNA replicates

*This stage

What happens in the 2nd stage of cell division?

The chromosomes line up along the equator and then are pulled to each end of the cell by cell fibres attaching

The nucleus will divide (mitosis)

What happens in the 3rd stage of cell division?

Cytokinesis will take place (cytoplasm + cell membrane divide to form 2 individual daughter cells)

When will the DNA replicate; Before, during or after the division?

Before to ensure each cell has the right no. of organelles

What did Mendeleev do in his periodic table that made it significantly remembered?
He left _____ for _______ elements

He left gaps for undiscovered elements

Horizontal rows are called?

Periods

Vertical columns are called?

Groups

What did John Newlands notice?
When organised by ____ _____, every _____ element had ______

When organised by atomic weights, every eighth element had similar properties

What is an element?
A _______ that consists of ___ ____ of atom and cannot be ______ down any further

A substance that consists of one type of atom and cannot be broken down any further

Mendeleev arranged by atomic ____

Newlands arranged by atomic _____

Mendeleev arranged by atomic mass

Newlands arranged by atomic weight