If an atom were the size of a stadium, its nucleus would be a pea on the centre spot. Almost all the matter you touch is, on this scale, empty space wrapped around a tiny, heavy core.
An atom is mostly empty space, with a tiny, dense, positively charged nucleus of protons and neutrons at the centre and electrons orbiting around it. Almost all the mass of the atom is in the nucleus.
An atom has a tiny, dense, positively charged nucleus of protons and neutrons at its centre, with negatively charged electrons orbiting around it.
Most of the atom is empty space, yet nearly all its mass is in the nucleus.
Explore the nucleus and the orbiting electrons, and see how little of the atom is actually filled.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
The nucleus of an atom is...
The nucleus is made of...
Electrons in an atom...
Most of an atom is...
The nucleus is thousands of times smaller than the atom but holds almost all the mass.
Nearly all the mass of an atom is in the nucleus, even though the nucleus is thousands of times smaller than the atom. The electrons fill the volume but contribute almost no mass.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
Almost all the mass of an atom is found in...
The overall charge on the nucleus is...
Compared with the whole atom, the nucleus is...
The nuclear atom is mapped. Keep the chain going.