McMurry (kap.1,1)

Question 1

What does an atom consist of?

Answer 1

A dense positively charged nucleus surrounded by negatively charged electrons

Question 2

What does the nucleus consist of?

Answer 2

Protons (which is positively charged particle) and neutrons (which are neutral charged particles)

Question 3

Is there the same amount of protons and neutrons in an atom?

Answer 3

Yes, although if the neutron and proton count is not the same, then the atom is an Isotope.

The proton count is always the same as the atomic number

Question 4

What determines if an atom is negatively charged or not?

Answer 4

The proton count and electron count in an atom is the same, if the electron count differs, then the atom will be negatively charged.

An atom can for example become (+)-charged by turning into a cation, which it does in ionic bonds.

Question 5

What is the atomic number? (Z)

Answer 5

It is the number that is unique for each element in the periodic table = determines the number of protones the atom has - thereby also the number of electrons in an uncharged atom.

Question 6

What is the mass number (A)?

Answer 6

The mass of the atom (weight of the protons, neutrons and also electrons combined).

Question 7

Does Isotopes of the same atom have the mase mass number (A)?

Answer 7

No, they differ (different count of neutrons)

Question 8

what is atomic weight?

Answer 8

Its the weighted average mass of an elements naturally occurring isotopes - the one u can see in the periodic table.