Periodic table review quiz

The element with atomic number 26 will be found in group :

• (a) 2

• (b) 8

• (c) 6

• (d) 10

Answer explanation

The valence shell configuration of Z= 26 is [Ar] 3d6 4s2 . That for the group of element is 6 + 2 =8

Which color on the image of the periodic table corresponds with the noble gases.

• red

• black

• blue

• orange

Which of these elements has an electron structure most similar to that of element X?

• 1
• 2
• 3
• 4

The symbols W, X, Y, and Z represent four elements shown on the outline of a periodic table.
Which element has the highest electronegativity?

• W
• X
• Y
• Z

What is the family name of this group of elements? 

• Alkali metals 
• Halogens 
• Noble Gases 
• Alkali Earth Metals 

How many neutrons are located in the nucleus of an atom that has 12 protons, 12 electrons, and an atomic mass of 28 amu?

• 12

• 16

• 28

• 40

Valence electrons are

• the number of electrons in the outer most energy shell.

• the number of protons in the nucleus.

• the atomic mass.

• total number of electrons.

Which of the following will have a larger radius than Zinc?

• Gallium
• Aluminum
• Magnesium
• Strontium

The elements with atomic numbers 9, 17, 35, 53, 85 are all ———-

• (a) halogens

• (b) noble gases

• (c) alkali earth metals

• (d) transition metals

Answer explanation

Solution: The elements of atomic numbers 9, 17, 35, 53, 85 are respectively F, Cl, Br, I, At etc are called halogen.

Which of the following electronic configurations of an atom has the lowest ionisation enthalpy?

• (a) 1s2 2s2 2p3

• (b) 1s2 2s2 2p6 3s1

• (c) 1s2 2s2 2p6

• (d) 1s2 2s2 2p5

Answer explanation

Solution: Ionisation enthalpy is the amount of energy required when an electron is removed from the outermost orbit of an isolated gaseous atom. Electronic configuration of 1s2 2s2 2p6 3s1 has lowest ionisation enthalpy.