The electron configuration of an atom of Chlorine Cl (neutral
Chlorine) is:
1s2 2s2 2p6 3s2 3p5
Now if the Chlorine becomes an ion, it becomes Cl-. So we
can see that 1 electron is added therefore the new electron configuration is:
1s2 2s2 2p6 3s2 3p6
Isotopes are forms of the same elements which contain equal number of protons but different number of nucleus in their nuclei, thus the differ in relative atomic mass but they have same chemical properties. The mass number is the summation of number of proton and number of neutron of an atom. If the mass number is known, then one need to know the number of proton in the atom in order to calculate for the number of neutron.
Answer:
9.133×10^-6 m
Explanation:
A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light. Photons are always in motion and, in a vacuum, travel at a constant speed to all observers of 3 x 10^8 m/s.
From the question, the following details were supplied;
Energy of the photon (E) = 4.61×10^−19 J
Speed of light (c) = 2.99×10^8 m/s
Plank's constant (h) = 6.626×10^−34 J⋅s
Wavelength of the photon (λ)= ??? The unknown
From
E=hc/λ
λ= hc/E
Substituting values
λ= 6.626×10^−34 × 2.99×10^8/ 4.61×10^−19
λ= 91.33×10^-7 m
λ= 9.133×10^-6 m
Answer:
a mole of lactic acid = 90 g
a 0.5 M solution would require 1/2 mol or 45 g
Explanation:
The molecular mass is 90 d, the combined atomic masses of its atoms.