Answer : Valence electrons in atom A = 1, B = 6 and C = 2.
Explanation :
Valence electrons means the outermost electrons are the ones which involved in bonding. Electrons are arranged in energy levels or shells.
Valence electrons are found in the highest energy orbitals of an element.
- The electronic configuration of (Na) is
. The highest energy orbital is 3s orbital which contains 1 electron. So,
The number of valence electrons in (Na) = A = 1
Similarly,
- The electronic configuration of (O) is
. The highest energy orbital are 2s and 2p orbitals which contains (2 + 4) = 6 electrons. So,
The number of valence electrons in (O) = B = 6
- The electronic configuration of (Fe) is
. The highest energy orbital is 4s orbital which contains 2 electrons. So,
The number of valence electrons in (Fe) = C = 2
Vegetable oil is a mixture
I think the answer would be A ! Hope this helps
Answer:
52.0004 grams of mass of potassium superoxide is required
Explanation:
Let moles carbon dioxide gas be n at 22.0 °C and 767 mm Hg occupying 8.90 L of volume.
Pressure of the gas,P = 767 mm Hg = 0.9971 atm
Temperature of the gas,T = 22.0 °C = 295.15 K
Using an ideal gas equation to calculate the number of moles.
n = 0.3662 mol
According to reaction, 2 moles of carbon-dioxide reacts with 4 moles of potassium superoxide.
Then 0.3662 mol of of carbon-dioxide will react with:
of potassium superoxide.
Mass of 0.7324 mol potassium superoxide:
0.7324 mol × 71 g/mol = 52.0004 g
52.0004 grams of mass of potassium superoxide is required.
Answer:
Option B
Explanation:
For the problem in question 12, option B is the correct choice. It rightly expresses how electrons will fill the third energy level of aluminum.
Aluminum is an element with 13 electrons. It has 3 energy levels.
The shell notation is given as 2 8 3
Sublevel notation = 1s² 2s² 2p⁶ 3s² 3p¹
The third energy level is given as 3s² 3p¹
We can represent it as: ⇅ ↑
3s² 3p¹
