What does the period number tell us about an element?

Answer 1

The period tells us 3 things:

# As you go from left to right across each period, the number of protons in the nucleus increases # As you go from left to right across each period, the reactivity of each element decreases (E.g. Sodium is very reactive but argon is very stable as it is a noble gas) ∴ tells us about the reactivity # It tells us the number of shells there are for each element (E.g. Magnesium has 3 shells [2.8.2], ∴it is in the 3rd period)

Answer 2

For elements it's the atomic number not the "Period Number." This number tells you how many protons a single atom of that element has in its nucleus.

The "period number" is a dimensionless quantity used in fluid dynamics.

Answer 3

it just means that all of the elements in the periodall have the same energy levels.and how many energy levels there is gonna be.-----------------------------------------------------------------------------------------------------

The answer above is incorrect. A period number actually tells how many shells a atom has.

For example; Curium's period number is 7, so it has 7 shells.

btw, whoever answered this first, that's pretty bad you got outsmarted by a 8th grader!

Answer 4

the Periodic Table should tell you:

• atomic number
• atomic weight
• element symbol
• name of element

specifically, though, the period tells you the number of electron energy shells the elements in it have; for example, elements in the 2nd period (or row) have 2 energy shells.

Answer 5

The period number tells you how many shells a atom has.

Ex; Curium's period number is 7, so it has seven shells. :)

Answer 6

They tell you the outer electron configuration, and determines many chemical properties of the element