Advertisements
Advertisements
Question
Which among the following is the largest element?
Options
Na
Mg
K
Ca
Advertisements
Solution
K
Explanation:
Atomic size generally increases down a group (as more electron shells are added) and decreases across a period from left to right (as the effective nuclear charge increases, pulling electrons closer).
- Na and Mg belong to Period 3, while K and Ca belong to Period 4. Therefore, K and Ca are larger than Na and Mg.
- Within Period 4, Potassium (K) is to the left of Calcium (Ca), meaning it has a lower effective nuclear charge and a larger atomic radius.
APPEARS IN
RELATED QUESTIONS
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
3Li, 14Si, 2He, 11Na, 15P Which of these elements belong to be period 3?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
4Be, 6C, 8O, 5B, 13Al Which is the most electropositive element among these?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
19K, 3Li, 11Na, 4Be Which of these atoms has smallest atomic radius?
Write the scientific reason.
The third period contains only eight elements even though the electron capacity of the third shell is 18
An element has its electron configuration as 2,8,2. Now answer the following questions.
i. What is the atomic number of this element?
ii. What is the valency of this element?
iii. What is the group of this element?
iv. To which period does this element belong?
v. With which of the following elements would this element resemble?
`_7N , _4Be , _18Ar , _17CL`
An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
An element has its electron configuration as 2, 8, 2. Now answer the following question.
Which of the following elements would this element resemble?
(Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)
Which among the following elements would lose an electron easily?
Find the odd one out and give its explanation.
Answer the following question in one sentence.
Write the name of an element having electronic configuration 2,8,2.
Match the columns.
| Column A | Column B |
| 1) s -block | a) Lanthanides and actinides |
| 2) p -block | b) Group 3 to 12 |
| 3) d -block | c) Group 1, 2 |
| 4) f -block | d) Group 13 to 18 |
| e) Zero group |
The number of electrons in the outermost shell of an atom determines the ______.
Write the name.
The element having stable electron configuration from the third period.
Write the name.
The group of elements having electronic configuration 2, 2.
Right or wrong sentence.
The elements lithium and beryllium are in the same period because their valencies are similar.
Beryllium and calcium are alkaline earth metals.
Right or wrong sentence.
The number of shields decreases as the calculation goes down from top to bottom.
Distinguish between:
Group - Period
