Question 2 (1 point) (03.01 MC)
Which of the following is true about two neutral atoms of the element gold? (1 point)
The nucleus is missing in both.
Each has a different mass.
Oc
Both have the same properties.
Each has a different number of electrons.

What is the number of atoms in 3.54 mol s

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

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