The diagram shows a simple model of an event that is part of the rock cycle. image Which type of event is most likely occurring in the diagram? A. the compacting of layers by high pressure and heat that leads to metamorphic rock
B. the cementing of layers of sediment particles that leads to sedimentary rock
C. the melting of sediment particles that leads to igneous rock
D. the hardening of liquid magma that leads to igneous rock

D. the hardening of liquid magma that leads to igneous rock

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