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Science

The Periodic Table

Atomic structure - higher - Test

1.

An atom is neutral because:

2.

An atom has an atomic number of 13 and a mass number of 27, which means:

3.

The symbol 235U represents a uranium atom. Which answer best describes the nucleus of a uranium atom?

4.

Potassium has an atomic number of 19. What is its correct electron structure?

5.

Which of the following are isotopes of the same element: 3H, 2H+, 1H, H2