This Grade 9 science worksheet helps students understand atoms and elements.
Students will complete fill-in-the-blank questions covering protons, neutrons, electrons, and the periodic table.
Atoms and Elements — Practice
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Try these before or after you print the worksheet. The printable asks you to fill in the words. This asks where each particle sits and what charge it carries — the part a list of names leaves out.
Question 1 — put them in order
Click these in order, from the smallest to the largest.
Proton → nucleus → atom → matter. Protons sit inside the nucleus, the nucleus sits inside the atom, and everything you can touch is made of atoms.
Question 2
Which particle is positively charged?
Protons are positive, electrons negative, and neutrons neutral — which is exactly what the name says.
Question 3
Where are the protons and neutrons found?
In the nucleus at the centre. Only the electrons move around outside it.
Question 4
What is the difference between an atom and an element?
An element is made of one type of atom. One atom of gold is an atom; a bar of nothing but gold atoms is the element.
Question 5
What does the atomic number count?
Protons. It is the atom's identity — change it and you have a different element.
Question 6 — select all that apply
Select every particle found inside the nucleus, then press Check.
Protons and neutrons — and protons are the positively charged particles, which is why that option counts too. Electrons stay outside.
Think about it
Protons are positive and electrons negative. Why is a whole atom usually neutral?
The nucleus is tiny compared with the whole atom. What is everything else?
If you removed one proton from an atom, what would change?
Why is the atomic number more useful than the mass for naming an element?