In the periodic table of elements, what do all of the elements in group 2 have in common? a) an atom of each element can hold up to eight electrons in its outer energy level. b) an atom of each element can hold up to six electrons in its outer energy level. c) each element is an alkaline earth metal. d) each element is a halogen. e) each element is dull, brittle, and breaks easily.

Option (C) is the correct answer.

Explanation:

Elements of group 2 are also known as alkaline earth metals. Elements of this group are beryllium, magnesium, calcium, strontium, barium and radium.

Since, all of them belong group 2 so, they have 2 valence electrons in their outer most shell.

Also, being metals all of them except radium which is radioactive in nature are metals. They are good conductors of heat and electricity, they have shiny surface and they are also malleable and ductile in nature.

Hence, we can conclude that out of the given options in the periodic table of elements, all of the elements in group 2 have in common that each element is an alkaline earth metal.

a is the best answer your welcome

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .