What is the atomic number of Copper?

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Multiple Choice

What is the atomic number of Copper?

Atomic number tells you how many protons are in the nucleus, which defines the element. Copper has 29 protons, so its atomic number is 29. In a neutral atom, there are also 29 electrons. This places copper in period 4, group 11, with the symbol Cu. The other options correspond to different elements (oxygen, iron, sodium), not copper.

Atomic number tells you how many protons are in the nucleus, which defines the element. Copper has 29 protons, so its atomic number is 29. In a neutral atom, there are also 29 electrons. This places copper in period 4, group 11, with the symbol Cu. The other options correspond to different elements (oxygen, iron, sodium), not copper.

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