Element A has 6 valence electrons. Element B has 7 valence electrons. Both atoms must follow the octet rule. In the Lewis structure of AB2, the number of lone pair electrons on the central atom A is:

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

the child will have heterozygous dominant chromosomes as characters of his father are dominant over the characters of his mother.

the child is heterozygous

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.