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
Answer: I think its 32 I'm not sure
Explanation:
Determine the number of significant figures in each of the following measurementsA). 11 soccer player
B). 0.070020 meter
C). 10,800 meters
D). 0.010 square meter
E). 5.00 cubic meters
F). 507
Answer:
Volume = (0.62 m)^3
Explanation:
If the density of silver is 10.5 g/cm, the volume of the silver is (0.62 m)^3.
Answer:
1 M
Explanation:
The molarity of a solution, M, is a measure of the concentration of that solution and it refers to the number of moles of solute (mol) per liter (L) of solution. The molarity (M) can be calculated using the formula:
M = number of moles (n) /volume (V)
In this question, a 500 ml aqueous solution of Na3PO4 was prepared using 82g of the solute.
Molar mass of Na3PO4 = 23(3) + 15 + 16(4)
= 69 + 31 + 64
= 164g/mol
Mole = mass/molar mass
mole = 82/164
mole = 0.5 mol
Volume in Litres (L) = 500 ml ÷ 1000 = 0.500L
Therefore, Molarity (M) = 0.5/0.500
Molarity = 1 M or 1 mol/L
