The Atomic World (VCE SSCE Chemistry): Quizzes

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The Atomic World
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What did Dalton incorrectly believe about atoms?

They were indivisible

When was the scanning tunnelling microscope developed?

19811981

How many times smaller is an electron than a proton?

18001800 times

What percentage of an atom's mass does the nucleus contain?

99.97%99.97\%

What did Rutherford's gold foil experiment reveal?

Atoms are mostly empty space

What does the atomic number ZZ represent?

Number of protons

For 1840Ar^{40}_{18}\text{Ar}, how many neutrons are present?

2222

What are isotopes?

Atoms with same ZZ, different AA

What properties do isotopes share?

Chemical properties

For 1225Mg2+^{25}_{12}\text{Mg}^{2+}, how many electrons?

1010

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