If the mass number of some atom is 238 and the atomic number is 92, then how many protons, neutrons, and electrons are in the atom?

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

How are the terms group and period used on the periodic table