Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 2 - No. 19)
Which of the following best defines a 'period' in the periodic table?
A vertical column of elements with similar properties.
A horizontal row of elements.
A group of elements with the same number of neutrons.
Elements with the same number of valence electrons.
Explanation
A period is a horizontal row of elements.
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