Pass Check: Atoms & Reactions
Atomic structure, the periodic table, bonding and radioactivity.
Isotope
Atoms of the same element with the same number of protons but a different number of neutrons.
Ion
An atom or group of atoms that has lost or gained electrons, giving it an overall electric charge.
Covalent bond
A strong bond formed when two atoms share a pair of electrons.
Half-life
The time taken for the number of radioactive nuclei in a sample to halve, or for the count rate/activity to halve.
Quick check
Mixed quiz
1. What is Exothermic reactions?
2. What is the charge on a magnesium ion?
3. Why are noble gases unreactive?
4. Which is an element?
5. Why is the mass of an atom concentrated in the nucleus?
6. Which sub-particle is negative?
7. What is the trend in reactivity down Group 7?
8. What happens to reactivity down Group 1?