Chemistry

How many p-electrons are there in a Sulfur atom (At. No. 16)?

Which of these elements is a halogen?

Mendeleev's periodic table was based on:

The electronic configuration of an ion X2+ is 2, 8. What is the atomic number of X?

Identify the element that does not belong to the same group as others.

What is the maximum number of electrons that can be accommodated in the 'M' shell?

Isotopes of an element have different numbers of:

Which element is commonly used as a semiconductor?

The diagonal relationship in the periodic table is shown by:

What is the valency of Neon?

Which subshell has the lowest energy?

What is the name of the group 18 elements?

Which element has 4 valence electrons and is in Period 2?

The mass number of an element is the sum of:

Which of these is a liquid non-metal at room temperature?

What is the common valency of Group IIA (Alkaline Earth Metals)?

Which of the following elements is a metalloid?

The tendency of an atom to attract a shared pair of electrons is called:

Which element has the symbol 'Sn'?

How many shells are used in the electronic configuration of Calcium?