Three chromium isotopes are chromium -50, chromium-52, and chromium-53.How many neutrons are in each isotope, given that chromium has an atomic number of 24?
Answers
In chromium-52 there are 28 neutrons, because 28 + 24 = 52.
In chromium-53 there are 29 neutrons, because 29 + 24 = 53
Remember the atomic number, identifies elements it is different for every element and it is the number of protons in that element. So by adding that to the number of neutrons you can get the mass number.
Final answer:
Chromium-50 has 26 neutrons, chromium-52 has 28 neutrons, and chromium-53 has 29 neutrons.
Explanation:
Chromium has an atomic number of 24, which means it has 24 protons. To determine the number of neutrons in each chromium isotope, subtract the atomic number from the mass number. For chromium-50, subtracting 24 from 50 gives you 26 neutrons. For chromium-52, subtracting 24 from 52 gives you 28 neutrons. And for chromium-53, subtracting 24 from 53 gives you 29 neutrons.
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If you are eating a hamburger, it is an example of a consumer eating another consumer.a) true b) false
Answers
Answer:
Joseph John Thomson studied the properties and the effects of the cathodic rays. Thomson's experiments involved the passage of electricity through a high-vacuum cathode-ray tube composed by a positive electrode (anode) and a negatively charged cathode. This experiment was crucial to describe the nature of the electric discharge.
Explanation:
Michael Faraday placed two electrodes in water solution and then he observed how electricity forces can separate elements in the solution.
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Answers
All atoms can be identified by the number of protons and neutrons they contain. The number of protons present in the nucleus of an atom of potassium - 42 is 19.
What are protons?
The particles which are smaller in size than an atom are called subatomic particles. An atom contains three sub atomic particles, they are protons, electrons and neutrons. The positively charged particles are called protons whereas the negatively charged particles are electrons.
The neutrons are chargeless particle. Here K - 42 is a radioactive isotope which has the atomic number 19. So the number of protons is 19 and the number of neutrons is:
A = Z + N
N = A - Z
= 42 - 19 = 23
The number of protons or electrons is the atomic number whereas the mass number is the sum of protons and neutrons.
Thus the number of protons is 19 and neutrons is 23.
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b. Prediction
c. Adequacy
d. Efficiency
Answers
Criteria for evaluating alternative solutions includesall of the following except :
a. Appropriateness
b. Prediction
c. Adequacy
d. Efficiency
Criteria for evaluating alternative solutions includesall of the following except prediction. The answer is letter B.
Answers
Answer:
Mass of water (m) = 25 grams = 0.025 kg (since 1 g = 0.001 kg)
Specific heat of water (c) = 4.18 J/(g°C) = 4.18 J/(kg°C)
Initial temperature () = 22°C
Final temperature ( )= 45°C
Change in temperature (ΔT):
ΔT=-
=45°−22°=23°
Now, calculate the heat energy (Q)
Q=mass×specific heat×ΔT
Q=0.025kg×4.18J/(kg°C)×23°C
Q≈2.44kJ
So, the heat energy for this scenario is approximately 2.44 kilojoules (kJ).
FALSE
Answers
The statement “Ionic crystals are extremely malleable because they contain a positively charged metal ion” is false. Ionic crystals are composed of positive and negative ions that are combined so that the numbers of positive and negative charges are equal.