Answer:
1. The first three Hydrogen atoms have the same number of protons
2. The first three Hydrogen atoms are also isotopes of each other
3. The third Hydrogen atom and the first Helium atom have the same mass number
4. The second Carbon atom and the first Oxygen atom both have the same number of neutrons
Explanation:
1. The number on the top left tells us the mass number while the bottom left number tells us the atomic number. The atomic number is equal to the number of protons.
2. An isotope is when there is an equal amount of protons, but a different number of neutrons. Neutrons can be calculated by taking the mass number and subtracting the atomic number.
3. As said before, the mass number is the number on the top left of each symbol. Look for atoms with the same mass number.
4. Neutrons can be calculated by taking the mass number and subtracting the atomic number. The second Carbon atom and the first Oxygen atom both have six neutrons. 14 - 6 = 8 neutrons for the second Carbon and 16 - 8 = 8 neutrons for the first Oxygen atom.
Answer : The number of moles of is 0.6156 moles.
Solution : Given,
Mass of = 186.7 g
Molar mass of = 303.256 g/mole
Formula used :
Now we have to calculate the moles of .
Therefore, the number of moles of is 0.6156 moles.
Ground water is known for that
Answer:
The elements in each group have similar chemical properties.
Explanation:
This is correct because all elements in a group have a similar electron configuration in the outer most shell, therefore they will have similar chemical properties.
Answer:
A
Explanation:
Ductility, because it can be observed by altering the shape of the substance