An atom of oxygen is in an excited state. When an electron in this atom moves from the third shell to the second shell, energy is(1) emitted by the nucleus
(2) emitted by the electron
(3) absorbed by the nucleus
(4) absorbed by the electron
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An atom of oxygen is in an excited state. When an electron in this atom moves from the third shell to the second shell, energy is emitted by the electron. Hence, option B is correct.
What is an atom?
The smallest piece of stuff that still retains its characteristics is an atom. A gold atom, for instance, is the smallest piece of that element that will still retain all of gold's properties and behaviors. When an atom is disassembled into its component parts, the subatomic particles found inside each have special characteristics that are not at all similar to those of the element the atom represents. Protons, neutrons, and electrons are the three different subatomic particle kinds.
The electron that transitioned from a higher to a lower level felt the change in energy level. Since the nucleus is unaffected, its energy levels are unaffected as well. Since it requires more energy to keep an electron at a higher energy level than a lower one, the shift in energy levels indicates that the electron released some energy.
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Related Questions
Which of the following is true about bases?a. They help to build up cells.b. They release hydroxide ions in solution.c. They tend to decrease the pH of a solution.d. They have a sharp or sour taste. explain
The _______ is the total number of organisms that an ecosystem can support.a. tolerance rangeb. carrying capacityc. competitive exclusion principled. population
An object has a density of 1.75 g/mL. Will it float on water? Why?
What is the percent composition of hydrogen in NH4HCO3?
Answers
Answer:
same number of protons as electrons
Explanation:
The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element. ... If you change the number of electrons in an atom, you will get an ion of the element.
b.compound
c.mixtures
d.solution
Answers
A compound is a substance in which all the exact combinations of elements are always the same. The correct option is b.
What is a compound?
Compounds are substances that are made up of two or more substances or elements. A compound is a mixture of two elements, they share bonds with each other, and they form a totally different substance than the above elements.
For example, NaCl is a compound. It is formed by two elements, sodium, and chloride. These elements form a different compound that is common table salt.
Some compounds are pure substances because they are made up of only elements that mix together. They do not contain any impurity or any other substance. They share chemical bonds with each other.
Thus, the correct option is b. compound.
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source is Glencoe Science book grade 7.
Also I just happening to be learning about this at school
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Hydrogen bonds are formed when a hydrogen atom is attracted to an atom with extremely high electronegativity. Hydrogen bonds can only be formed with O, N, or F atoms.
Covalent bonds are formed with the sharing of electrons between atoms.
Answer:A.) ionic bond
Explanation:
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A sample of seawater has a mass of 158g and a volume of 156mL. its density is 1.012 g/mL.
According to the question the data are given is as follows:
volume of sea water = 156 mL
mass of sea water = 158 g
density of sea water can be calculated by the following formula :
D = M / V
where,
D = density
M = mass of sample
V = volume of sample
substituting all the value in the given formula , we get :
D = 158 g / 156 mL = 1.012 g/mL
Density of seawater = 1.012 g / mL
Thus, A sample of seawater has a mass of 158g and a volume of 156mL. its density is 1.012 g/mL .
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