is in the middle of the atom and contains protons and neutrons. It has a positive charge.

The total number of protons and neutrons.

...move around the nucleus in electron shells and is negatively charged. Electrons are tiny!

...are useful for the hydrogenation of alkenes.

Test

C4 ATOMS

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Preguntas del test (10)

1The nucleus ..
1. Ais in the middle of the atom and contains protons and neutrons. It has a positive charge.
2. BThe total number of protons and neutrons.
2Electrons ...
1. A...move around the nucleus in electron shells and is negatively charged. Electrons are tiny!
2. B...are useful for the hydrogenation of alkenes.
3The mass of a proton is ...
1. A1
2. B2
3. C3
4The mass of a neutron is ...
1. A0
2. B1
3. C3
5The mass of an electron is ...
1. A5
2. B0.5
3. C0.0005
6The charge of a proton is ...
1. A+2
2. B0
3. C+1
7The charge of a neutron is ...
1. A0
2. B1
3. C2
8The charge of an electron is...
1. A1
2. B-1
3. C0
9Who concluded from his experiments that atoms weren't solid spheres?
1. AJ J Thomson
2. BJohn Dalton
3. CRutherford
10Bohr suggested that electrons can only exist in _?_, or _?_.
1. Anuclear atom | particle
2. Bfixed orbits | energy
3. Cfixed orbits | shells