Question

Define the following

Answer 1

1) Element is the purest form of substance.
5) Valency is the capacity of an element to combine.
2) The official names and symbols of elements.

HEY MATE
I KNOW THESE ONLY

Answer 2

Answer:

1. any substance that cannot be decomposed into simpler substances by ordinary chemical processes.

2. Chemical symbols are abbreviations used in chemistry for chemical elements, functional groups and chemical compounds.

3. Atomicity is defined as the total number of atoms that constitute a molecule.

4. A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element.

5. the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.