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Which response includes all the following statements that are TRUE, and no false statements? a. isotopes of an element differ in the number of protons they have b. the number of protons in an atom is its atomic number c. the mass number of an atom is the sum of the number of protons plus electrons in the atom d. the volume of an atom comes primarily from its nucleus; the mass of an atom comes primarily from its electrons

Which element is not correctly classified? Element Classification S nonmetal Ge metalloid H metal Li representative metal W transition metal

Which of the following correctly classifies this substance, O2?

What would you multiply moles of calcium (Ca) by to get the units grams of calcium?

How many protons, neutrons and electrons are there in a neutral atom of the isotope with the nuclear symbol:  ? [protons], [neutrons], [electrons]

The atomic number gives the number of ____ and ____ in a neutral atom. (Give your answer in the form ____, ____)

How many electrons are present in a SINGLE lead atom with a mass number of 207?

A neutral atom of an element that has three electrons in its valence shell is: 

Based on trends in electronegativity, which atom has the highest electronegativity value?

Based on periodic trends, which has a higher ionization energy, Mg (#12) or Ba (#56)?