Which of the following atoms has the larhest atomic radius na k mg ca

Explanation:

Atomic size

in is defined  as size of on atom or distance from nucleus to outermost shell of an atom.  

 ALONG GROUP -->  it increases.  

For example:- Consider 1st group

Li – 3  2,1    K,L  

Na- 11  2,8,1  K, L, M  

K- 19  2, 8, 8, 1  K,L, M, N  

As we move down the group. , every time a new shell is being added due to which size of an atom increases.  

Along  period - it decreases.  

For example:- consider 3rd period  

Na  Mg  Ar  Si  

2,8,12,8,22,8,32,8,4  

We see every time, a new electron is added to the same shell due to which nuclear charge increases and size decreases.  

That is the reason ,In the above asked question : out of all K is bigger .

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.