The fourth period contains 18 elements, beginning with potassium and ending with krypton. As a rule, period 4 elements fill their 4s shells first, then their 3d and 4p shells, in that order; however, there are exceptions, such as chromium.
Cr. I think
The relative mass of an electron is 1/1840 the mass of a C-12 atom. Hence, option B is correct.
<h3>What is an electron?</h3>
An electron is a negatively charged subatomic particle.
An electron is very small, about 1/1,837th the mass of a proton. Atomic Weights Atomic mass of an atom is expressed in atomic mass units (amu) which are approximately grams. A more conventional way of expressing the mass of an atom is Atomic Weight.
Atomic mass units are expressed relative to the atomic mass unit of an unbound neutral carbon-12 atom.
Hence, the relative mass of an electron is 1/1840 the mass of a C-12 atom.
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Answer:
0.187 mol
Explanation:
A solution is created by dissolving 10.0 grams of ammonium chloride in enough water to make 315 mL of solution.
The formula of ammonium chloride is NH₄Cl and its molar mass is 53.49 g/mol. We can use this information to calculate the moles of ammonium chloride associated with 10.0 grams.
10.0 g × (1 mol/53.49 g) = 0.187 mol
Answer is: a) I only.
Above critical temperature of CO₂, a gas cannot be liquefied no matter how much pressure is applied. Temperature and pressure above its critical point is called supercritical fluid and this is <span>intermediate between gaseous and liquid states.</span>