An element with atomic number 14 has the number of electrons in its valene shell;

1. 1
2. 2
3. 4
4. 8
Show Answer
Answer: C
Explanation:
• Sine electronic configuration of Si₁₄ is; K = 2 , L = 8, M = 4
0 0 Complains

The number of electrons in the outermost shell of potassium is;

1. 2
2. 8
3. 18
4. 1
Show Answer
Answer: D
Explanation:
• Since electronic configuration of K₁₉ = [Ar] 4s¹
0 0 Complains

The maximum number of electrons in the outermost orbit of an atom is;

1. 2
2. 8
3. 18
4. 32
Show Answer
Answer: B
Explanation:
• Octet rule is followed and filling of sub-shells is according to n + l rule.
0 0 Complains

How many electrons are present in the third energy level of an atom of calcium (atomic no. 20)?

1. 2
2. 8
3. 18
4. 10
Show Answer
Answer: B
Explanation:
• N/A
2 2 Complains

Which one of the following pairs of elements has same number of electrons in the valence shell?

1. He and Li
2. B and C
3. C and N
4. Be and Ca
Show Answer
Answer: D
Explanation:
• Both Be and Ca beleng to II-A group and have 2 electrons each in their valence shell.
0 0 Complains

e/m value for electron is:

1. 1.76 x 10⁸ coulomb / g
2. 1.76 x 10¹¹ coulomb / g
3. 1.76 x 10^-8 coulomb / kg
4. 1.6 x 10^-19 coulomb / g
Show Answer
Answer: A
Explanation:
• N/A
0 0 Complains

e/m value for electron can be calcualted by the formula:

1. e/m = E / B² r
2. e/m = B² r / E
3. e/m = B / E² r
4. e/m = E² / B r²
Show Answer
Answer: A
Explanation:
• N/A
0 0 Complains

The value of charge on an electron as determined by Milakan is:

1. 9.1 x 10^-31C
2. 6.1 x 10¹⁸C
3. 1.6 x 10^-19C
4. 1.6 x 10¹⁹C
Show Answer
Answer: C
Explanation:
• N/A
0 0 Complains

The mass of an electron is:

1. 9.1 x 10^-31g
2. 9.1 x 10^-28g
3. 1.6 x 10^-19Kg
4. 9.1 x 10^-27Kg
Show Answer
Answer: B
Explanation:
• N/A
0 4 Complains

The correct mass of an electron is:

1. 9.1 x 10^-31Kg
2. 9.1 x 10^-28g
3. 9.1 x 10^-25mg
4. all of these
Show Answer
Answer: D
Explanation:
• N/A
0 0 Complains