TH/CH - Periodic table and Isotopes

Mendeleev first ordered the periodic table of elements by increasing

• atomic number

• atomic mass

• atomic symbol

• atomic weight

The modern periodic table is ordered by....

• Atomic mass

• Atomic number

• Atomic Weight

• Symbol

What was the reason that Mendeleev left gaps in his periodic table?

• He wanted to let someone else complete the table

• To make it look more organised

• For undiscovered elements

• For unnamed elements

Choose the statements which apply to Mendeleev's periodic table ONLY

• Ordered by atomic mass

• Had gap's

• Ordered by atomic number

• Elements are arranged into groups and periods

• Elements with similar properties are grouped together

Choose the statements which apply to BOTH Mendeleev's and the modern periodic table.

• Ordered by atomic mass

• Had gap's

• Ordered by atomic number

• Elements are arranged into groups and periods

• Elements with similar properties are grouped together

Vertical columns on the periodic table are called ___?

• groups

• periods

• rows

• families

Horizontal rows on the periodic table are called ___?

• groups

• periods

• rows

• families

Elements in the same group have __________

• Similar Properties

• Same number of shells

• Similar Mass

The group number of an atom tells us.....

• How many electrons it has

• How many shells it has

• How many electrons it has in its outer shell

• How many electrons it has in its first shell

The period number of an atom tells us....

• How many electrons is has on its outer shell

• How many shells it has

• How many electrons are on the first shell

• The shell which has the most electrons on it