The atomic number of an element X is 17. Predict (a) its valency, (b) whether it is a metal or nonmetal (c ) the nature of the element, (d) the name of the element and ( e) the relative size with respect to other members of its group .

The atomic number of an element is 16. Predict its valency

The atomic number of an element is 16. Predict its group number

The atomic number of an element is 16. Predict the formula of its chloride

The atomic number of an element is 16. Predict the number of valence electrons in its atom

The atomic number of an element is 16. Predict whether it is a metal or a non-metal

The atomic number of an element Y is 17. The number of electrons in its ion Y^(-) will be:

The atomic number of an element is 19. (a) Write the electronic configuration of the element and determine (i) the valency of the element and (ii) whether the element is a metal or non-metal. (b) Write the formula of the oxide of the element. (c) Is the element more reactive or less reactive than Na (atomic number 11). Justify your answer giving example.

The electronic configuration of an element Z is 2, 8, 8. (a) What is the atomic number of the element ? (b) State whether element Z is a metal or a non-metal (c) What type of ion (if any) will be formed by an atom of element Z ? Why ? (d) What is special about the outermost electron shell of the atom of this element ? (e) Give the name and symbol of element Z (f) Name the group of elements to which Z belongs.

If the atomic number of an element X is 17, then what will be the atomic number of the element lying in the same group as that of X but in the fifth period?

Atomic number of an element is 16. Predict. (i) the number of valence electrons in its atom (ii) its valency (iii) its group number (iv) whether it is a metal or a non-metal (v) the nature of oxide formed by it. (vi) the formula of the chloride.