Ch 5 practice test Chemistry

Mendeleev left spaces in his periodic table because he predicted several elements and their _______.

• atomic numbers

• colors

• properties

• radioactivity

Tags

NGSS.HS-PS1-1

A negative ion is known as a(n)

• ionic radius

• valence electron

• anion

• cation

The ionization energies for removing successive electrons from sodium are 496 kJ/mol, 4562 kJ/mol,

6912 kJ/mol, and 9544 kJ/mol. The great jump in ionization energy after the first electron is removed indicates that

• sodium has 4 or five electrons

• the atomic radius has increased

• a d-electron has been removed

• the noble gas configuration has been reached

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which represents a neutral atom gaining an electron in an exothermic process?

Tags

NGSS.HS-PS1-2

For each successive electron removed from an atom, the ionization energy _______.

• increases

• decreases

• remains the same

• shows no pattern

The period of an element can be determined from its _______.

• reactivity

• symbol

• electron configuration

• density

Tags

NGSS.HS-PS1-1

Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing _______.

• atomic number

• density

• reactivity

• atomic mass

Barium, atomic number 56, is the fifth element in Group 2. What is the atomic number of radium, the next element in Group 2?

• 64

• 74

• 88

• 103

Period 4 contains 18 elements. How many of these elements have electrons in the d sublevel?

• 8

• 10

• 16

• 18

The group of 14 elements in the seventh period that have occupied f orbitals is the _______.

• actinides

• lanthanides

• transition elements

• metalloids