1. How are the elements arranged in the periodic table?
- By increasing atomic number.
- By decreasing relative charge.
- By increasing number of electrons.
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2. Why are elements in the same period together?
- Because they have the same atomic number.
- Because their electrons occupy the same number of shells.
- Because they have the same number of electrons on their outer shell.
3. What are isotopes?
- Elements with the same number of outer electron shells.
- Elements with the same atomic number but different mass numbers.
- Elements with the same mass numbers but different atomic numbers.
4. Why is an atom neutral?
- Because there is an equal number of protons and electrons which balances the number of positive and negative charges.
- Because there are more neutrons than protons and electrons so there is a stronger neutral charges.
- Because there are only neutrons in the nucleus which is the heaviest part meaning the overall charge is neutral.
5. What makes up the nucleus of an atom?
- Protons and neutrons.
- Neutrons and electrons.
- Electrons and Protons.