The number of outermost electrons present in the outermost shell of an atom is called?
Bonded electrons
Non-bonding electrons
Valence elctrons
Anti-bonding electrons
The vertical columns in the modern periodic table is called?
Groups
Periods
Line
Class
Group 2 elements are calle?
Halogens
Noble gases
Alkali metals
Alkaline earth metals
The law used by Newlands to arrange elements is known as?
Law of triads
Mesdeleev's Law
Modern Periodic Law
Law of octaves
The arrangements of elements in a group of three is known as?
Newland's Law
Dobereiner's Triads
Mendeleev's Law
Elements from s - block and p - block are called?
Transition elements
Representative Elements
Atomic radius of sodium in picometre is ?
99
132
143
190
The number of periods in modern periodic table?
12
8
7
14
The group in which all elements are gases at room temperature is ?
Group 18
Group 3
Group 12
Group 5
How many elements are there in period of a periodic table?
8 elements
2 elements
3 elements
16 elements
