Answer:francium
The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.
Explanation:
Answer:
See below.
Explanation:
1 H (hydrogen) has a nucleus of just 1 proton.
2 H (deuterium) has a nucleus of 1 proton and 1 neutron
3 H (tritium) has a nucleus of 1 proton and 2 neutrons.
Answer:
compound
Explanation:
A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
