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How many valence electrons are present in Nitrogen (Z=7)?
Which period of the periodic table contains only two elements?
The Modern Periodic Law states that properties of elements are periodic functions of their:
Which of these is the most reactive alkali metal?
Elements that show properties of both metals and non-metals are called:
Which element is the most abundant metal in the Earth's crust?
The elements with atomic numbers 58 to 71 are known as:
What happens to the metallic character of elements as we move from left to right across a period?
Identify the element with electronic configuration: 2, 8, 8, 2.
Which property decreases down a group in the periodic table?
Elements of group 17 are also called halogens because:
Which element has the electronic configuration \(1s^2 2s^2 2p^6 3s^2 3p^1\)?
Which of the following atoms has the highest first ionization potential?
The number of neutrons in the nucleus of an atom with atomic number 'Z' and mass number 'A' is: