Answer:
b) [Ar]4s²3d1¹
Explanation:
Chromium, Cr, is the atom with atomic number 24 (That is, 24 protons).
A Cr³⁺ contains 3 electrons less than number of protons. That is 21electrons.
The Argon, Ar, contains 18 electrons. That means the electronic configuration of Cr³⁺ contains 3 electrons more than Ar.
Following the Hund's rule, these three electrons will occupy the 4S orbital (2 electrons) and the 2d orbital (1 electron).
Thus, right solution is:
<h3>b) [Ar]4s²3d1¹</h3>
Answer:
70.0 %
Explanation:
Step 1: Given data
- Mass of nitrogen (mN): 74.66 g
- Mass of the compound (mNxOy): 250 g
Step 2: Calculate the mass of oxygen (mO) in the compound
The mass of the compound is equal to the sum of the masses of the elements that form it.
mNxOy = mN + mO
mO = mNxOy - mN
mO = 250 g - 74.66 g = 175 g
Step 3: Determine the percent composition of oxygen in the sample
We will use the following expression.
%O = mO / mNxOy × 100%
%O = 175 g / 250 g × 100% = 70.0 %
Fusion
Fusion is the process where two light nuclei combine
together releasing vast amounts of energy. As a future energy source, fusion
will have advantages as the absence of carbon emissions. The only by-products
of fusion reactions will be negligible quantities of helium which do not
contribute to pollution.
Fusion is not a type of chemical reaction. False.
Surface tension is the result of water molecules pulling inward with a strong attractive force.
The attractive force brings the molecules on the surface of the water close together.
The attractive force causes the surface of the water to be drawn toward the water molecules beneath the surface. <span>
Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.</span>
