My element is sodium 1. summarize the physical and chemical properties of the element you selected. 2. in the lesson, many models were used to depict the atom. how did these models you understand atomic structure? 3. how do protons, neutrons, and electrons differ in terms of their electrical charges and locations within the atom? 4. describe the four fundamental forces. which of these forces are involved in chemical bonding?answer these questions or at least one.

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

it's c. elements are placed in rows based on how may valencies electrons have.