Name: Class: Date:

Physical Science Grade 8

Chapter 4 Elements and the Periodic Table

Instructions: Complete the crossword puzzle. Use the clues to help identify the words.

C H E M I C A L

I A O L L

N E U T R O N E M A L L E A B L E

E O D C A O E

R M U T S Y T

T I C R S A L K A L I

C T O L

S I N P A

G E I V H A L O G E N

R M S E M I M E T A L A K A

O I O T A M E T A L

U C T Y L M R

P R O T O N I A A P

N P N N O N M E T A L

D E E S R

U I I

C R A D I O A C T I V I T Y O

T I D

O O

R N

9

11

3

9

8

11 2

1512 14

4

13

77

17

6

21

2019

22

10

16

18

5

Across

1. ____ symbol: A one or two letter representation of an element.

6. A small particle in the nucleus of the atom, with no electrical charge.

7. A term used to describe material that can be pounded into shapes.

9. ____ metal: An element in Group 1 of the periodic table.

14. An element found in Group 17 of the periodic table.

16. An element that has some characteristics of both metals and nonmetals.

17. A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.

19. A positively charged particle that is part of an atom's nucleus.

21. An element that lacks most of the properties of a metal.

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22. The spontaneous emission of radiation by an unstable atomic nucleus.

Down

1. electrical ____: The ability of an object to transfer electric current.

2. A negatively charged particle that is found outside the nucleus of an atom,

3. A mixture of two or more elements, one of which is a metal.

4. ____ gas: An element found in Group 18 of the periodic table.

5. ____ number: The number of protons in the nucleus of an atom.

7. ____ number: The sum of protons and neutrons in the nucleus of an atom.

8. ____ particle: A fast moving electron that is given off as nuclear radiation.

9. ____ particle: A type of nuclear radiation consisting of two protons and two neutrons.

10. A material that conducts current under certain conditions.

11. ____ earth metal: An element in Group 2 of the periodic table.

12. Elements in the same vertical column of the periodic table; also called a family.

13. An atom with the same number of protons and a different number of neutrons from other atoms of the same element

15. ____ radiation: A type of nuclear radiation made of high energy waves.

18. ____ metal: One of the elements in Groups 3 through 12 of the periodic table.

20. A horizontal row of elements in the periodic table.

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