The atomic number of Unnilunium is-
1. 111
2. 110
3. 101
4. 107

The increasing order of the ionic radii of the given isoelectronic species is :

1. ${\mathrm{S}}^{2-},{\mathrm{Cl}}^{-},{\mathrm{Ca}}^{2+},{\mathrm{K}}^{+}$

2. ${\mathrm{Ca}}^{2+},{\mathrm{K}}^{+},{\mathrm{Cl}}^{-},{\mathrm{S}}^{2-}$

3. ${\mathrm{K}}^{+},{\mathrm{S}}^{2-},{\mathrm{Ca}}^{2+},{\mathrm{Cl}}^{-}$

4. ${\mathrm{Cl}}^{-},{\mathrm{Ca}}^{2+},{\mathrm{K}}^{+},{\mathrm{S}}^{2-}$

The ionic radii (in Å) of the isoelectronic species \(\mathrm{N^{3-}}, \mathrm{O^{2-}}, and~ \mathrm{F^-}\) are respectively:

1. 1.36, 1.40 and 1.71

2. 1.36, 1.71 and 1.40

3. 1.71, 1.40 and 1.36

4. 1.71, 1.36 and 1.40

The correct sequence which shows decreasing order of the ionic radii of the elements is: 

1.  O²⁻ > F⁻ > Na⁺ > Al³⁺

2.  Al³⁺ > Mg²⁺ > Na⁺ > F⁻ > O²⁻

3.  Na⁺ > Mg²⁺ > Al³⁺ > O²⁻ > F⁻

4.  Na⁺ > F⁻ > Mg²⁺ > O²⁻ > Al³⁺

The set that contains atomic numbers of only transition elements is:

1. 21, 32, 53, 64

2. 9, 17, 34, 38

3. 21, 25, 42, 72

4. 37, 42, 50, 64

Find the correct increasing order of ionic radii for the following isoelectronic species:

N³⁻, O²⁻, F⁻, Na⁺, Mg²⁺ and Al³⁺

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
1. 16, 6 and 3
2. 15, 6 and 12
3. 16, 5 and 2
4. 15, 5 and 3

Which of the following represents the correct chemical formula of the compound formed by the combination of aluminium and sulphur?

The IUPAC name and symbol for the element with atomic number 120 are respectively:
1. Unnilbium; Ubn
2. Unbinilium; Ubn
3. Ununbium; Uub
4. Unbinilium; Uub

In which of the following arrangements the order is not according to the property indicated against it?