The larger number found in an element square tells us this.
The atomic mass.
100
The nucleus of the atom is made of these two subatomic particles.
Protons and neutrons
100
What is the molar mass of CaCl2?
110 g/mol
200
The number of protons in an atom.
The atomic number.
200
How are elements arranged on the periodic table?
By their atomic number.
200
Where are electrons located in an atom?
Orbits.
200
How many grams of silver are in 4.5 moles?
486 grams
300
A counting unit that is equal to Avogadro's number.
A mole.
300
This element has an atomic mass of 20.
Neon
300
An atom has 20 protons, 20 neutrons and 18 electrons. What type of atom is it? What is its charge?
An ion. It has a 2+ charge.
300
How many molecules are in 0.78 moles of MgI2?
4.70 x 10^23 molecules
400
The smallest subatomic particle.
An electron
400
Bromine is found in what family on the periodic table?
The halogens.
400
An atom has 3 isotopes. The first isotope is 49.2% abundant with a mass of 48.6 amu. The second isotope is 18.7% abundant with a mass of 46.7 amu. And the third isotope is 32.1% abundant with a mass of 47.2 amu. What is the average atomic mass of the element?
47.80 amu
400
How many grams are in 6.78 x 10^22 molecules of CO2?
4.95 grams
500
A form of an atom that has a different number of electrons and protons.
An ion.
500
An element has 17 protons and 18 neutrons. What is the name of the element, and in what family is it found?
Chlorine, Halogens
500
An element with two isotopes has an average atomic mass of 87.56 amu. The first isotope is 93.1 % abundant with a mass of 88.10. What is the mass of the second isotope?
80.27 amu
500
How many nitrogen atoms are in 45.60 grams of Ca(NO3)2?