Atomic Structure: Key terms.

Question 1

What is the atomic number?

Answer 1

= number of protons.

Question 2

What is the mass number?

Answer 2

= Protons + Nuetrons.

Question 3

What are Isotopes?

Answer 3

= Atom of an element with different number of nuetrons
= all atoms of an element have the same number of protons.

Question 4

For neutral atoms that have no overall charge what is the configuration?

Answer 4

protons = electrons.

Question 5

What do negative ions have?

Answer 5

= more electrons than protons.

Question 6

What do positive ions have?

Answer 6

= more protons than electrons.

Question 7

What is the relative isotopic mass?

Answer 7

= mass of an atom of an isotope compared to 1/12 of the mass of c-12.
= 1 for each isotope of an element
= WHOLE NUMBER
= units

Question 8

What is an ion?

Answer 8

= An atom with an overall charge from loosing or gaining electrons.

Question 9

What is relative atomic mass (Ar)?

Answer 9

= weighted mean mass of an atom of an element compared to 1/12th of c-12.
= weighted for the abundance of each isotope
= no units
=

Question 10

What is the equation for relative atomic mass?

Answer 10

(mass of isotope 1 x percentage abundance) + (mass of isotope 2 x percentage abundance)
/
100