Chapter 9 - Chemical Names and Formulas - 9 Assessment - Page 302: 123

This is because when Groups 1A and 2A become like noble gases, they lose electrons and the nucleus gets stronger making the radius smaller. For Group 7A, they gain an electron making the atom bigger.

This is because when Groups 1A and 2A become like noble gases, they lose electrons and the nucleus gets stronger making the radius smaller. For Group 7A, they gain an electron making the atom bigger.