Boron is an element with atomic number 5. Write down some compounds of boron.

write electronic configuration of group 18 elements

Boron is an element with atomic number 5. Mention any two uses of boron.

Based on the hints given, find out the atomic numbers and write down the subshell electronic configuration of elements (Symbol and not real) i) A - period 3, group 6 ii) B - period 4, group 6

The element Cu with atomic number 29 undergoes chemical reaction to form an ion with oxidation number +2. a) Write down the subshell electronic configuration of this ion? b) Can this element show variable valency? Why? c) Write down the chemical formula of one compound formed when this elemrnt reacts with chlorine (Cl_17)

The atomic number of an element is 15 .its mass number is31. Write the electronic configuration and draw its Bohr model.

The element Cu with atomic number 29 undergoes chemcial reaction to formation with oxidation number +2: write down the subshell electronic con-figuration of the ion.

In an atom of the element X there are three shells and 2 electrons are in its outermost shell. a) Write down the electronic configuration of this element. b) Find the group and period of this element. c) What is the valency shown by this element.

Element 'X' is having atomic number 28, it gives two electrons to element 'Y': Write down the electronic configuration of 'X' and its ion.