Matter Worksheets

Matter Worksheets
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Name _____________________________

Date ___________________

Structure of an Atom
Complete the puzzle.

				1				2

					3
			4
	5
6
			7	8			9
10

			11						12

					13

		14				15

ISOTOPES	POSITIVE	ATTRACTION	PROTON
NEUTRON	NEGATIVE	GREATER	NEUTRAL
ORBIT	NUCLEUS	SPACE	EQUAL
LESS	MASS	ELECTRONS

down 2. The central part of an atom.	down 3. One of the two particles that make up a nucleus. This has a positive electric charge.	down 5. The mass of a proton is approximately ____ to the mass of a neutron.	down 6. The majority of an atom's ____ is in its nucleus.
down 7. An atom with more electrons than protons has a ____ charge.	down 9. An atom with more protons than electrons has a ____ charge.	down 12. A ____ atom has the same number of protons and electrons.	across 1. These move around an atom's nucleus and have a negative electric charge.
across 4. One of the two particles that make up a nucleus. This has no electric charge.	across 8. Atoms, which are the same element and have the same number of protons, but have different numbers of neutrons.	across 10. The majority of an atom is empty ____.	across 11. The ____ between negative and positive protons help to maintain an atom's structure.
across 13. The path that an electron takes as it moves around the nucleus.	across 14. The mass of a electron is more than 1,800 times ____ than the mass of an proton.	across 15. The mass of a proton is more than 1,800 times ____ than the mass of an electron.

Answer Key