Many people believe that the atomic number of the atom is the number of electrons in the atom. describe when this is the case. a) as the atom absorbs photons the electrons excite and produce unique emission spectrum. b) through radioactive decay the electrons and neutrons form unique atomic number isotopes. c) when the atom is neutral and the number of electrons and the number of protons are equal. d) whether the atom is neutral or charged the number of electrons is always a unique identifier.

The number of electrons in an atom is the same as the atomic number

C) when the atom is neutral, and the number of electrons equals the number of protons.

The number of electrons is never a unique identifier of an atom (it’s the number of protons!).

Thus, electronic excitation and radioactive decay are also incorrect options.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

b is the correct answer

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