Periodic table

Which of the following groups is nonmetallic and has the outermost electron configuration of the form ns2np5

• Alkali metal group

• Halogen group

• Group of alkaline earth metals

• Group of noble gases.

Chemical elements in the same group A have the following properties:

• As the nuclear charge increases, the metallic character increases, and the non-metallic character increases.

• As the nuclear charge increases, the metallic character increases and the non-metallic character decreases.

•   As the nuclear charge decreases, the metallic character increases and the non-metallic character decreases.

•    As the nuclear charge decreases, the metallic character decreases and the non-metallic character decreases.

Elements in the main subgroup of group VII (VIIA) are also known as

• alkali metals

• alkaline earth metals

•   halogen

•    noble gas

How many periods and columns are present in the periodic table?

• 7 periods and 18 columns

• 8 periods and 7 columns

• 7 periods and 7 columns

• 8 periods and 8 columns

An element belongs to period 2 and group 2th number of valence electrons in the atoms of this element is

• 2

• 4

• 3

• 1

Which elements are not in the same group?

• Li, Na, K

• Be, Mg, Cr

• Ca, Sr, Ba

• Cl, Br, I

Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?

• O < F < N

• N < F < O

• O < N < F

• F < O < N

At the time of Mendeleev, the number of elements known was

• 63 

• 65

• 62

• 64

Element ‘X’ forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:

• Si    

• Mg

• Al

• Na

The elements in the periodic table announced by Mendeleev are arranged in ascending order

• atomic mass.

• atomic radius.

• atomic number.

• the electronegativity of the atom