Answer:
X+ ion cation is smaller than neutral atom because when one or more electrons are lose by an atom it usually result in lose of shell.
And when electron is removed positive/ negative charged ratio increas which causes more effective nuclear charge.
The more effective nuclear charge the less its size.
Explanation:
Meteoroids are smaller than comets and asteroids.
Answer:
All statements are true
Explanation:
Arrhenius theory:-
The Arrhenius theory was introduced introduced by Swedish scientist named Svante Arrhenius in 1887.
According to the theory, acids are the substances which dissociate in the aqueous medium to produce electrically charged atoms ( may be molecule). Out of these species furnished, one must be a proton or the hydrogen ion,
.
Hence, statement 1 is correct.
Bronsted-Lowry base is the specie which accepts the proton form the medium. For example, Benzoate ion is the conjugate base of the benzoic acid. It is a Bronsted-Lowry base and the dissociation of benzoate ion can be shown as:-
Hence, statement 2 is correct.
Acetic acid will dissociate as:-

Hence, statement 3 is also correct.
The number of valence electrons of elements in a group is the same as the group number