1.The physical and chemical properties of the elements are the  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven of their atomic numbers.
2.The modern periodic table is a tabular arrangement of elements in  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven and  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven .
3.The horizontal rows are called  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven. There are  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven periods in the periodic table.
4. The vertical columns in the periodic table starting from top to bottom are called  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven. There are  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven groups in the periodic table.
5. The  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven and  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven, which form part of Group 3 are called inner transition elements.
6. Anything which repeats itself after a regular interval is called  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven and this behaviour is called  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven.
7.Atomic radius in metal atoms is known as  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven .
8. In non-metallic elements, their atomic radius is known as  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven radius.
9. the gain of an electron by a neutral atom forms a negatively charged ion called  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven.
10.Ionisation energy is also called as  18ActinidesanioncolumnsCovalentgroupsionisation enthalpyLanthanidesmetallic radiusperiodicperiodic functionsperiodicityperiodsrowsseven.