Question

Across
2. Number of protons in the nucleus of an atom
4. The sum of protons and neutrons in an atom
6. Smallest unit of an element
8. The horizontal rows of the periodic table
9. Negatively charged particle that moves inside the nucleus of an atom
10. Elects whose atoms commonly have three or fewer electrons in out energy
level
11. Atoms of the same element with different numbers of neutrons
12. Elements that are in a group of 17 in the periodic table
14. The ease of which an element reacts to another element
17. Area around the nucleus occupied by electrins
19. A vertical column in the periodic table
20. Arrangement of the chemical elements in rows according to atomic number​

Answer 1

Answer:

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