How is the number of neutrons and in nucleus of an atom calculated
Answers
Explanation:
Atomic number is defined as the sum of total number of protons present in an atom. Each element has different atomic number.
Whereas mass number is the sum of total number of both protons and neutrons present in an element.
For example, an atom with mass number as 15 and has atomic number 7. Then it means it has 7 protons.
Therefore, number of neutrons present in it will be calculated as follows.
Mass number = no. of protons + no. of neutrons
15 = 7 + no. of neutrons
no. of neutrons = 15 - 7
= 8
Thus, we can conclude that the number of neutrons is calculated as mass number minus total number of protons present in the atom.
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What is the median of the following set: 2, 4, 6, 8, and 10?
When placed in a freezer, liquid water turns into solid ice. What best describes this change?The water molecules slow down, bonds are broken, and the separated atoms spread out. The water molecules slow down, stronger attractions form between them, and the molecules stop flowing around. The water molecules speed up, attractions between them become weaker, and the molecules spread out. The water molecules speed up, new bonds are formed, and the new molecules are pulled closer together.
The atmosphere's variable gases that most influence the greenhouse effect are _____. nitrogen and oxygen argon and carbon dioxide carbon dioxide and water vapor water vapor and ozone
A scientist tests a new cough medicine by giving it to a group who have colds. The scientist gives another group with colds a liquid and tells them it is cough medicine. The people in both group are women between the age of 20 and 30 who normally are in good health
Answers
A mixture of sand and table salt can be separated by filtration because the substances in the mixture differ in solubility in water. Thus, the correct option for this question is D.
What is meant by Solubility?
Solubility may be defined as the phenomenon in chemistry that involves the maximum amount of a substance that will significantly be disbanded in a given amount of solvent at a particular temperature.
The answer to the above question is better understood by the fact that when you mix both salt and sand in the water, you may find that salt is completely soluble in water while sand is not. This is because the bond of water is not competent enough to dissolve the sand.
Therefore, the correct option for this question is D.
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calcium
rubidium
strontium
Answers
The element which has an electron configuration of [Kr] 5s² is calcium .
It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with sameatomic numberare atoms of same element.
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Answers
Health claim must be supported by scientifically valid evidence to be approved in using for food label.
This is also a food guide to all consumers the food content implied by manufacturers to their products.
Answer is Health Claim
B. The modern model states that atoms of all elements are identical, whereas Dalton’s model does not.
C. The modern model recognizes particles in the atom, whereas Dalton’s model does not.
D. The modern model does not explain emission spectra, whereas Dalton’s model does.
Answers
The modern model recognizes particles in the atom, whereas Dalton’s model does not. The correct option is C.
What is an atom?
An atom is a matter particle that truly represents a chemicalelement. An atom is made up of a central nucleus encircled by one or more electrons.
Each electron carries a negative charge. The nucleus is positively charged and encompasses one or more protons and neutrons, which are relatively heavy particles.
According to current theory, electrons are in orbits all over the nucleus, which is made up of protons and neutrons.
It also indicates that all orbits are not the same and that their structures differ. According to quantumtheory, waves are associated with the properties of matter.
Dalton'smodel does not recognize particles in the atom, whereas the modern model does.
Thus, the correct option is C.
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For the Quantum mechanical model, A is untrue. The QM model is far more accepted than Dalton's because it explained the workings of the atom far better than any before.
For the NB model however, that was not accepted as much because it only worked when working with Hydrogen.
B: No model states that each atom is identical.
C: Dalton's model did NOT recognize particles in the atom, but the NB and QM models do.
D: The reverse is true.
So the answer is C.
b.form a tsunami.
c.stay in the same place.
d.mix together in the water cycle.
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When different parts of the oceans are heated unevenly, this causes the water to A. move in convection currents
What happens when different parts of the oceans are heated unevenly?
When different parts of the oceans are heated unevenly, it leads to temperature variations within the water. Warm water tends to rise, creating convection currents. This movement is driven by the principle that warm fluids are lighter and, therefore, buoyant, while cooler fluids are denser and tend to sink. This process is analogous to the movement of air in the atmosphere.
So, the uneven heating of ocean waters results in the generation of convection currents, as warm water ascends and cooler water descends. This phenomenon plays a crucial role in redistributing heat and influencing climate patterns across the globe.
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Answer:
a
Explanation:
Answers
Answer:
By measuring the total mass of the matter before as well as after any physical or chemical change.
Explanation:
As mentioned, according to the law of conservation of matter, no atoms can be created or destroyed when under physical or chemical change.
Naturally, all the matters have some mass associated with it.
To verify the law of conservation of matter, at first, measure the mass of matter before it underwent any physical or chemical change. Then, again, measure the mass of the matter after the physical or chemical change.
Now, observe both the mass, both must be equal. This verifies the law of conservation of matter.