An element has atomic number 19. where would you expect this element in the periodic table and Why ?

An element has atomic number 17. Where would you expect this element in the periodic table ? Why .

An element has atomic number 19. Where would you expect this element in the period table and why ?

The Atomic number of an element is 35 where would you expect the position of this element in the periodic table ? Why ?

If the element with atomic number 18 is a noble gas, to which group do you expect the elements with atomic numbers 17 and 19 belong?

The element A has atomic number 15. To which period of the periodic table the element belongs?

An atom of an element X has 2 electrons in its N shell. Where is this element placed in the periodic table ?

An element 'A' has atomic number 28. What is the electronic configuration of the elements below it in the periodic table? Predict their chemical properties.

Sodium and aluminium have atomic numbers 11 and 13 respectively. They are separated by one element in the periodic table and have valencies 1 and 3 respectively . Chlorine and potassium are also separated by one element in the periodic table. Their atomic numbers are 17 and 19 respectibely, buth both have a valency of 1. Explain why.