Periodic Classification
Classification of elements in various periodic table.
Questions
The modern periodic table has elements arranged in increasing atomic numbers. It has ___________vertical columns and ________horizontal rows.
- 18 and 7
- 8 and 7
- 8 and 8
- 18 and 9
- None of these
The only non-metal in first group is _________.
- Cs
- Na
- H
- Fr
- Li
Which of the following is/are the limitation of Newlands octaves?
- Valid for lighter elements only
- Octave was valid up to Ca
- Isotopes could not be accommodated
- Fe was placed far from Co and Ni
- All of these
Inner transition elements include _____________.
- lanthanides
- metalloid
- actinides
- option 1 and 2
- option 1 and 3
The term "transition elements" most commonly refers to the d-block transition elements. Which of the following elements does not belong to this group?
- Iron (Fe)
- Copper (Cu)
- Gold (Au)
- Aluminium (Al)
- Silver (Ag)
Which of the following gases belonging to the inert gases group, is radioactive?
- Krypton
- Neon
- Radon
- Xenon
- Argon
Elements having the same number of valence electrons are placed in the same group. Elements having valence electrons equal to 3 are placed in which of the following groups?
- 3
- 13
- 12
- 18
- Any of the above
Which of the following statements regarding the metallic character trend in the periodic table is true?
- Ability to lose electrons decreases along the period from left to right.
- Ability to form ionic chlorides decreases along the period from left to right.
- Ability to form basic oxides decreases along the period from left to right.
- Ability to displace hydrogen from dilute acids decreases along the period from left to right.
- All of these
Which of the following statements is/are false regarding halogens?
a. They exist in all three states.
b. They are all metals.
c. They are highly electronegative.
d. The boiling point decreases downwards.
- Only a
- Both b and d
- Both a and c
- Only d
- Only b
Which of the following statements is/are true, regarding the trends in a periodic table?
(a) Valency increases on moving from top to bottom in a group.
(b) Metallic properties decreases on moving from left to right in a period.
(c) Atomic mass increases on moving from top to bottom in a group.
(d) Electronegativity increases on moving from left to right in a period.
- only a
- only b
- both a and b
- b, c and d
- both b and d
The prediction of Mendeleev regarding the discovery of some elements were exact. Which of the following elements discovered were accommodated into the periodic table without disturbing it?
- Scandanium
- Noble gases
- Germanium
- Gallium
- All of these
Which of the statement/s is/are incorrect regarding the trends in the periodic table?
- Number of valence electrons remains the same while moving from top to bottom in a group.
- Number of valence electron increases while moving from left to right in a period.
- Valency remains the same on moving from top to bottom in a group.
- Valency increases while moving from left to right in a period.
- Atomic radius increases on moving from top to bottom in a group and decreases on moving from left to right in a period.
Which of the following elements, valence electrons and their position in the modern periodic table are correctly matched?
| Element | Valence electrons | Group in PT |
| He | 2 | 2 |
| Na | 1 | 1 |
| Al | 4 | 13 |
| Cl | 7 | 7 |
- He
- Na
- Cl
- Al
- None of these
According to Newlands, sodium and lithium are placed in the same column. Which option gives the correct reason?
- They have similar properties.
- They have the same atomic mass.
- They belong to the same triad.
- Both had same size.
- None of these
Who did the first classification of elements and arranged three elements in a group?
- Mendeleev
- Newlands
- Dobereiner
- Henry Moseley
- None of these