Horizontal pressure gradient forces are generated within thermal circulations because: o cold air rises and warm air sinks. o aloft, high pressure develops in cold air regions while low pressure develops in warm air regions o at the surface, high pressure develops in warm air regions while low pressure develops in cold air regions o in cold regions, isobars bunch closer together, while in warm regions, they spread farther apart

mention the spill to the teacher clean the area and throw the broken pieces away

explanation:

- 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

it is the most commonly accepted one

points

explanation: