You haven't attached any options but anyways, to help you with your question, elements belonging to the same group (e.g. alkali metals, noble gases) all have the same chemical properties. Hydrogen, for example, have the same properties with Sodium, Potassium and Lithium.
ANSWER
An atom of element is electrically neutral because the number of positive protons are equal to number of negative electrons.
Answer:1 mol
Explanation:
the conversion from mol to volume of gas at STP is 22.4L, meaning that the amount of mols in a gas of volume 22.4L at STP is one mol.
(7th grader sorry if its wrong)
CO3 = carbonate ion
So, CaCO3 = calcium carbonate
Other name for CaCO3 are: Limestone and Marble
