1. The chemical composition of diamond is
2. Consider the following statements with reference to the periodic table of chemical elements.
1. Ionization potential gradually decreases along a period.
2. In a group of elements, electron affinity decreases as the atomic weight increases.
3. In a given period, electronegativity decreases as the atomic number increases.
Which of these statement(s) is/are correct?
1. Ionization potential gradually decreases along a period.
2. In a group of elements, electron affinity decreases as the atomic weight increases.
3. In a given period, electronegativity decreases as the atomic number increases.
Which of these statement(s) is/are correct?
3. Approximately, how many different chemical elements exist in the Earth?
4. Which is the most abundant element after oxygen?
5. What is the usual property of oxides of Group III and IV?
6. Which of the following is the most common element in the Universe?
7. Assertion(A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group.
Reason(R): In a group, the atomic radii generally increase from top to bottom.
Reason(R): In a group, the atomic radii generally increase from top to bottom.