Atoms and elements Flashcards
1
Q
What is an element
A
A substance made from only one type of atom
2
Q
What is a compound
A
Two or more different atoms chemically joined together
3
Q
What is a mixture
A
Different elements,
molecules or compounds not chemically joined together
4
Q
What is the atomic number
A
The number of protons & neutrons in the nucleus
5
Q
What is the atomic mass
A
The number of protons in the nucleus
6
Q
An atom is made up from what
A
Protons,
neutrons and electrons
7
Q
What is the name of group 0/8 on the periodic table
A
Noble gases
8
Q
What is a similarity between mendeleevs periodic table and a modern periodic table
A
Metals and non-metals are separate
9
Q
Sodium+water=
A
Sodium hydroxide +hydrogen
10
Q
What is a safety precaution when reacting group 1 elements with water
A
Safety screen to stop anything spitting out
