Question

1. this atom generally forms up to four bonds with other atoms. it has 6 particles in its nucleus. it is also the major constituent of the air - breathe. 2. this atom has its second energy level completely filled. it has an even mass number. it also lights up the night sky in las vegas. 3. this transition metal is lighter than zinc and has an average atomic mass closest to its second lightest isotope. it is the most common element found in meteorites, one of which is shown here. 4. this radioactive atom has six electrons and eight neutrons. it is used to determine the age of many objects up to tens of thousands of years old. 5. this atom has three electrons in its third energy level. its mass number is one plus twice its atomic number. if aircraft were made of steel instead of this element, they would be too heavy to fly. 6. this alkali - earth element has six stable isotopes. it both strengthens bones and regulates heartbeat in many animals, including humans. 7. there are two ways to build the nucleus of this element. both have masses greater than one, and it is the only element where one isotope has more protons than neutrons. it can be used to make energy in a nuclear fusion reaction, and scientists have considered getting it from the moon because there is so little on earth. 8. this atom has only one stable isotope and five electrons in its outer shell. it is the most electronegative element, and it is added to our to help prevent tooth decay.

Explanation:

1. Hydrogen: It can form up to three bonds, is a major component of the air - breathe, and has 1 proton in its nucleus.
2. Neon: Neon has its second energy level completely filled and is used in neon lights in Las Vegas.
3. Iron: A common transition metal found in meteorites, lighter than zinc.
4. Carbon - 14: Radioactive with 6 electrons and 8 neutrons, used for carbon - dating.
5. Aluminum: Has 3 electrons in the third energy level, and aircraft are made of it to be lightweight.
6. Calcium: An alkali - earth element that strengthens bones and regulates heartbeat.
7. Helium: Used in nuclear fusion, and there are ways to build its nucleus with different proton - neutron ratios.
8. Fluorine: Has 5 outer - shell electrons, is highly electronegative, and added to prevent tooth decay.

Answer:

1. Hydrogen
2. Neon
3. Iron
4. Carbon - 14
5. Aluminum
6. Calcium
7. Helium
8. Fluorine