GENERAL KNOWLEDGE

Detailed explanation-1: -The fluorine atom has 7 electrons in the outermost shell and its valency could be 7. But it is easier for fluorine to gain one electron instead of losing seven electrons. Hence, its valency is determined by subtracting seven electrons from the octet and this gives you a valency of one for fluorine.

Detailed explanation-2: -By definition, valence electrons are the electrons located at the outermost shell of an atom. Since Fluorine has 2 electrons in the s orbitals and 5 in the p orbitals of shell number 2, there is a total of 7 valence electrons. Thus, there are 7 valence electrons in Fluorine.

Detailed explanation-3: -The correct option is H Fluorine Identify the elements with seven valence electrons.

Detailed explanation-4: -Fluorine is the ninth element with a total of 9 electrons. In writing the electron configuration for fluorine the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for F go in the 2s orbital. The remaining five electrons will go in the 2p orbital.