Question

Use the periodic table tile to answer questions #2 & 3 regarding Helium.

2. What is the atomic mass of Helium? Using that, determine the number of neutrons in a Helium atom.

3.What is the atomic number of Helium? What subatomic particle does it refer to?



4. Use the atomic model below to answer the following questions: 1 pt for each blank

Answer 1

Answer:

2. 4.002602 u

3. Its atomic number is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons. Since 2 + 2 = 4, we know that the mass number of the helium atom is 4.

Note: The red "balls" represent protons; the blue "balls" represent neutrons. The cloud of electrons that "orbit" an atom's nucleus and define the "size" of an atom is roughly 100,000 times as large as that atom's nucleus!

There are no red balls, but they're 16 blue balls.

Meaning that there are 16 neutrons.

The atom is phosphorus. if you look at the periodic table, phosphorus has 15 electrons and protons, and 16 neutrons.

Answer 2

Answer:

2. The atomic mass of Helium is 4. You subtract the atomic mass from the atomic number to find the number of neutrons, so do 4-2, which is 2.

3. The atomic number of Helium is 2. The atomic number refers to both the protons and electrons, since they are always the same, unless an ionic bond occurs. This means that it might have more protons than electrons, or the other way around.

4a. There are 16 protons. The amount of protons are the same as the amount of electrons, so count the electrons. Then, go to the periodic table and find the element with the atomic number of 16.

4b. There are 16 neutrons. Go to the periodic table and find the element with an atomic number of 16, then subtract the 16 by the atomic mass. The atomic mass is 32, so 32-16=16. This means that the element is Sulfur

4c. The name of this atom is Sulfur. Sulfur is the only element with 16 electrons and protons.