- What is the nucleus of an atom made up of?
- Explain why atoms that are arranged in the same vertical grouping of the
periodic table have similar chemical properties.
- Explain why Carbon is more likely to form covalent bonds with other atoms
as opposed to forming an ionic molecule.
- Explain why covalent bonds are better suited than ionic interactions to
hold molecules of your body together.
- How many cars are in a mole of cars?
- Describe, in detail, the formation of the ionic compound LiF.
- The nucleus of an atom is made up of protons and neutrons.
- Atoms arranged in the same vertical grouping of the periodical table have
similar chemical properties because they all have the same number of valence
electrons. The electrons are what reacts.
- Because carbon has four valence electrons, they have more energy and it is
more difficult for other atoms to 'steal' four electrons. Instead,
carbon 'shares' its electrons to become stable.
- Covalent bonds are better to hold molecules of your body together because
there can be long strands of covalent bonds which are strong, especially for
holding important life functions of the body together. Covalent bonds
aren't broken by hydrogen bonds.
- There are 6.02 x 10ēģ cars in a mole of cars.
- In the ionic compound LiF, neither of the atoms are stable on their
own. Li needs to lose an electron to be stable, and F needs to gain
one to be stable. The electrons attract, and Li gives up his valence
electrons to F. Li loses electrons and becomes positive, F gains
electrons and becomes negative. Opposites attract. Therefore,
they both become stable.