Grade 11 - Periodicity

When elements are arranged based on the rise of its relative atomic mass, element that differ one octaves has similar characteristic. It is called law of octaves. This law is expressed by

• Dalton

• Dobereiner

• Thomson

• Newlands

Period in periodic table states...

• Number of electrons in atom

• Number of neutrons in atomic nucleus

• Number of atomic shells

• Number of protons in atomic nucleus

The radius of K, Ca, Sc atom respectively are...

• Increasing

• Decreasing

• Increase and then decrease

• Have the same size

One of the elements with the following electron configuration having the greatest electronegativity is

• P = 2 . 5

• Q = 2 . 7

• R = 2 . 8

• S = 2 . 8 . 1

The first six ionization energies of four elements, A to D, are given. Which element is most likely to be in Group IV of the Periodic Table?

• A

• B

• C

• D

In 1999, researchers working in the USA believed that they had made a new element and that it had the following electronic structure.

[Rn] 5f⁴ 6d¹⁰ 7s² 7p⁶

In which group of the Periodic Table would you expect to find this element?

• Group 1 / IA

• Group 2 / IIA

• Group 16 / VIA

• Group 18 / VIIIA

Here list some of the elements:

Na, Mg, Al, Si, P, S, Cl.

From those elements, the wrong statement is ...

• Na is the most electropositive metals

• Cl has the lowest electronegativity value

• Al and Si have both metallic and non-metallic properties

• Cl have the greatest valence electrons

Which of the following oxides has the highest ionic character ?

• MgO

• Al₂O₃

• SiO₂

• Cl₂O₇

Which of the following oxides has the lowest melting point ?

• P₄O₁₀

• SO₂

• SiO₂

• Cl₂O₇

Which species has the largest radius?

• P^3-

• K⁺

• Cl^-

• Ar