Bohr's model treats electron energy levels as clearly defined orbital paths around the nucleus like planets orbit the Sun. The cloud model treats the energy levels as probability clouds, regions in which electrons are likely to be found.
Answer:
D
Explanation:
any of a large group of organic compounds occurring in foods and living tissues and including sugars, starch, and cellulose. They contain hydrogen and oxygen in the same ratio as water (2:1) and typically can be broken down to release energy in the animal body.
Answer:
one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
(B)
Explanation:
*The nycleus: contains the heredity materials i.e the chromosomes, DNA, RNA etc...
*The cytoplasm: contains all the organelles...
*The cell membrane: holds all the cell structures in place...
I hope it helps!!!
Their valency is one and both belong to the third period