What causes changes in weather? a. air masses move and meet. c. water evaporates. b. the air gets more humid. d. clouds form.

Air masses move and meet

Explanation:

The formation, movement, and collision of the air masses is one of the biggest and most noticeable changer of the weather conditions, be it locally, regionally, or globally. The air masses are constantly on the move, with the basic rule being - the heavier, denser air masses move toward the less dense, lighter air masses. Once they come in contact, the denser, heavier air masses push upward or backward the less dense, lighter air masses. The properties of the air masses depend on the place they have formed, so they can be dry, wet, cold, warm, and they are able to change the weather conditions literary in several minutes.

- 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