Which element is most likely to share electrons with other atoms in joint orbitals a) chlorine (7 valence electrons) b) calcuim (2 valence electrons) c) argon (8 valence electrons) d) carbon (4 valence electrons) e) potassium (1 valence electron)

Carbon.

Explanation:

Covalent bonds is the chemical bonds that are formed by the mutual sharing of the electrons. The covalent bond is the strongest bond in the nature.

Carbon has the ability to form to form covalent bond. Carbon neither gains electron ( 6 protons cannot hold 10 electrons) and nor looses electron ( due to high ionization energy). So carbon forms bonds by the sharing of the electrons with the other atoms even in joint orbital.

Thus, the correct answer is option (d).

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.