When element \(_{20}\)Y combines with element \(_8\)Z, it forms
A covalent compound , YZ is formed
A covalent compound, ZY is formed
An ionic compound, YZ is formed
An ionic compound, ZY is formed
Correct answer is C
Y = 2,8,8,2 and Z = 2,6.
Y will readily give off its 2 valence electrons and Z will accept the 2 electrons in order to achieve octet configuration. Hence, the compound YZ is formed by ionic bonding.
How many electrons are present in \(^9_4Be^{2+}\)?
2
4
5
6
Correct answer is A
Neutral Be has 4 electrons but \(Be^{2+}\) means it has lost two electrons from possible four and became a positive ion.
\(\therefore\) the number of electrons left will be equal to two.
136X
137X
196X
197X
Correct answer is A
No explanation has been provided for this answer.
The following atoms of carbon 126C, 136C and 146C can be described as?
Allotropes
Isomers
Isotopes
Isotones
Correct answer is C
No explanation has been provided for this answer.
Increase the reactant production
Increase the value of the equilibrium constant
Shift the equilibrium to the left
Decrease the value of the equilibrium constant
Correct answer is B
No explanation has been provided for this answer.