Atomic structure - Edexcel

1

Which of Dalton's ideas about atoms is no longer thought to be true?

2

What makes up the nucleus of most atoms?

3

Which of the subatomic particles has a mass of almost zero?

4

Why are most atoms neutral?

5

How many protons, neutrons and electrons are in an atom which has an atomic number of 11 and a mass number of 23?

6

What is the atomic number and the mass number of an atom with 29 protons, 36 neutrons and 29 electrons?

7

What is the name for atoms with the same atomic number but different mass numbers?

8

Why is the relative atomic mass of chlorine 35.5?

9

Which of these pairs of atoms are isotopes?

10

Boron naturally exists as two isotopes, boron-10 and boron-11. The abundance of boron-10 is 20% and the abundance of boron-11 is 80%. Using these figures, what is the relative atomic mass of boron? - Higher