Which of these statement best explains why atoms are overall neutral?

Choose 1 answer

there are equal numbers of positive protons and negative neutrons in the nucleus

there are equal numbers of positive protons and negative electrons in the atom

there are equal numbers of positive protons and neutral electrons in the nucleus

there are equal numbers of negative electrons and neutral neutrons in the atom

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Which of these particles can be found within the nucleus of an atom (select 2)?

Drag the images into the correct place.

Correct Answers

Incorrect Answers

protons

electrons

ions

neutrons

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How many protons and neutrons are there in cobalt?

Choose 1 answer

59 protons and 27 neutrons

27 protons and 59 neutrons

27 protons and 32 neutrons

27 neutrons and 32 protons

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What is the best definition of the relative atomic mass of an element?

Choose 1 answer

the number of protons in its atoms

the total number of protons and neutrons in its atoms

the average mass of its atoms compared to one-twelfth of the mass of a carbon-12 atom

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A sample of naturally occurring neon is 91% neon-20 and 9% neon-22. What is its relative atomic mass?

Choose 1 answer

21

21.8

20.2

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Answer incorrect

Look at the slide below to work out the answer.