Why is the r. a.m. value used? a. a single atom cannot be isolated, so only the average size of a group of atoms can be measured. b. the r. a.m. value is used to determine how many isotopes an element has. c. atoms are too small for their masses to be measured directly. d. none of these

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

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 will most likely happen when two bromine atoms bond together?