In the chemical formula 2H₂O, the number "2" before H₂O indicates that there are two molecules of water. Each molecule of water (H₂O) consists of two hydrogen atoms and one oxygen atom. Therefore, the formula represents a total of four hydrogen atoms and two oxygen atoms.
atomic number
It tells how many atoms are in one molecule normally.
CaC2(s) + 2H2O(l) --> C2H2(g) + Ca(OH)2(aq) Number of moles greater than 1 are prefixes of molecule formula's. Example: '2' in 2H2O(l)
The bigger number (Atomic mass) is the amount of protons (=same amount of electrons unless specified) and nutrons in an atom. The smaller number (atomic number) is the amount of protons only
The period tells you how many energy levels an atom has.
An exponent tells how many times a number is used as a factor.
An exponent.
The exponent tells you how many times a number or base is used as a factor.
The exponent tells you how many times the base is used as a factor.
The exponent tells us how many times a number is used as a factor.
round
What is it called to replace a number that tells about how many or how much
The fuse diagram tells you what each fuse is for (what circuit the fuseprotects) , the number on the fuse tells you how many amps the fuse can handle before it will blow.
The exponent.
A exponent is a number that tells how many times a base is used to factor. This is used in math.
In a balanced equation for the reaction, the coefficient appearing immediately before the formula for a reactant describes the number of moles of that reactant involved in the reaction shown by the equation.
The atomic number = Number of protons = Number of electrons