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Chapters 1-4 Crossword puzzle

Teacher: Arthi Srinivasan
Across
Number of protons in an element
These have the same atomic number, but different mass numbers
Group 1A elements are called ______ metals
Mass of a person is an example of _____ number
Down
Fundamental unit of an element
He identified the charge on electrons using oil drops
Substances made of two or more different atoms chemically attached to one another
These substances have definite shape and volume