50 POINTS IF YOU GET RIGHT -1) A solid metal sphere with a mass of 18.45 g is added to 21.7 mL of water in a graduated cylinder. The water level rises to 26.8 mL. Calculate the density of the sphere.
-2)What is the density of a metal cube that is 1.30 cm in length and has a mass of 8.402 g.
-3)The handbook density of gold is 19.3 g/cm3. In the lab a student observes it to 18.4 g/cm3. What is her percent error?

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms