Ca and Br because Ca, the metal, looses electrons and Br, the nonmetal, gains electrons.
Option (d) is the correct answer.
An ionic bond is formed between a metal and a non-metal as metals have more number of electrons and non-metals are electron deficient in nature.
So, in order to complete their octet metals lose electrons and non-metals gain them.
For example, calcium and bromine will form an ionic bond because being a metal calcium will lose electrons and bromine being a non-metal will gain electrons.
Thus, we can conclude that out of the given options, Ca and Br: Calcium easily loses electrons, and bromine gains them best describes a pair of elements that will form an ionic bond.
Lithium and oxygen can form an ionic bond, but its lithium that easily loses electrons, not oxygen because it only has one valence electron instead of six.
Phosphorous and chlorine don't form ionic bonds with each other for the same reason as carbon and hydrogen.
Calcium and bromine do form ionic bonds with each other, and calcium is the element that loses electrons because it only has two valence electrons instead of seven.
Ca and Br
Calcium easily loses electrons, and bromine gains them.
the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .
in scientific notation, the value of the speed of light in a vacuum
will be written as 2.995 * 10^8. when this value is represented in the form of
a * 10^b, then, a = 2.995 and b = 8.
the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.