The size of the nucleus varies as __________ power of the atomic number.
How and why does the atomic size vary as you go: 1. From left to right across a period? 2. Down a group? [3 MARKS]
Consider the following statements:
1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element.
2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.
3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes.
Which of the above statements is incorrectly stated?