Chemistry- Elements (year 9) Flashcards
1
Q
What is an element?
A
A substance made up of atoms that all have the same number of protons in their nucleus
2
Q
What decides the type of atom?
A
the number of protons in the nucleus
3
Q
What is known as an element?
A
if a substance only contains atoms with the same number of protons
4
Q
What are isotopes?
A
they are different forms of the same element which have the same number of protons but a different number of neutrons
5
Q
True or false: isotopes have the same atomic number but a different mass number
A
True
6
Q
What is the formula for the relative atomic mass?
A
Relative atomic mass = sum of isotope abundance x isotope mass number divided by the sum of abundances of all the isotopes
