How are elements organized?

In developing his periodic table, Mendeleev listed on cards each element’s

name, atomic mass, and

• atomic number.

• electron configuration

• isotopes.

• properties.

Mendeleev’s periodic table did not always list elements in order of increasing

atomic mass because he grouped together elements with similar

• properties.

• atomic numbers.

• densities.

• colors

Mendeleev predicted that the gaps in his periodic table represented

• isotopes.

• radioactive elements.

• permanent gaps.

• undiscovered elements.

The person whose work led to a periodic table based on increasing

atomic number was

• Moseley

• Mendeleev.

• Rutherford.

• Cannizzaro.

An electron that is found in the outermost shell of an atom and determines

the atom’s chemical properties is called a(n)

• valence electron.

• paired electron.

• p electron.

• octave electron.

The periodic law states that the physical and chemical properties of

elements are periodic functions of their atomic

• masses.

• numbers.

• radii.

• structures

Refer to a periodic table. In which period is calcium?

• Period 2

• Period 4

• Period 6

• Period 8

Refer to a periodic table. In which group is calcium?

• Group 1

• Group 2

• Group 17

• Group 18

An element that has the electron configuration [Ne]3s23p5 is in which

period?

• Period 2

• Period 3

• Period 5

• Period 7

An element that has the electron configuration [Ne]3s23p5 is in which

group?

• Group 2

• Group 5

• Group 7

• Group 17