The maximum covalency and highest oxidation state possible for an element with $Z=13$ are respectively.

What will be the formula of the compound formed between the following elements?
$(i)$ The element with atomic number $19$ and iodine.
$(ii)$ The first element and oxygen.

Consider the elements:
$Cs, Ne, I$ and $F$
$(a)$ Identify the element that exhibits only negative oxidation state.
$(b)$ Identify the element that exhibits only positive oxidation state.
$(c)$ Identify the element that exhibits both positive and negative oxidation states.
$(d)$ Identify the element which exhibits neither the negative nor does the positive oxidation state.

The most common oxidation state of an element is $-2$. The number of electrons present in its outermost shell is

The group number,number of valence electrons,and valency of an element with atomic number $15$,respectively,are

What is the oxidation state of iron in copper pyrites $(CuFeS_2)$?