What is atomic mass measured in on the periodic table?

Answers

Answer 1

Answer: the atomic mass of an element, is measured in amu

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Which of the notations below is another way to write the name of the following nuclide?A.iodine-53

B.iodide-53

C.iodide-127

D.iodine-127

Answers

Answer: D.iodine-127:

Explanation:

1) As per the definition of nuclide, it is the atomic spieces (the atom) characterized by the nucleons (protons and neutros).

2) To notation for a nuclide is the name of the atom followed by a hypen (without blank spaces) and the mass number.

3) The mass number is the sum of protons and neutrons.

4) From that, you can tell this about the four choices given:

A.iodine-53: is not correct because that would mean that the mass number is 53, which cannot be right as the atomic number of iodine is 53 meaning that it has 53 protons, and so that notation is not including the neutrons.

B.iodide-53: is not correct because the name of the atom is iodine, not iodide (also the mass number cannot be for the same reason explained above)

The name iodide is reserved for the ions from iodine not for the atom.

C.iodide-127: incorrect due to the name iodide, for the same reason explained above.

D.iodine-127: this is correct choice. It is the name of the isotope of the iodine with mass number 127, which means that the atom has 53 protons and 74 neutrons (53 is the atomic number and 74 is calculated from 127 - 53)

Answer:

iodine-127

Explanation:

I did a quiz and it was correct.

Scientific explanations of natural phenomena are based on A. opinion polls of scientists. B. only the observations made by a single scientist. C. only the most recent empirical evidence. D. all the empirical evidence available.

Answers

Answer: D. all the empirical evidence available.

Explanation:

Answer:

Explanation:

Why is glass a good substance for storing chemicals?A. Glass is a noble solid.
B. Glass has low reactivity.
C. Glass is cheap and readily available.
D. The melting point of glass is very high.

Answers

B, I just took the test and the correct answer is b. Cheap doesn't always equal quality.

Which of the following devices can measure only atmospheric pressure? A. Pressure gauge B. Barometer C. Tire gauge D. Mercury tube

Answers

B.) Barometer

Hope that helps :-)

Based on their locations in the periodic table, which of these elements would you expect to have the greatest atomic radius?A. cesium (Cs)
B. lithium (Li)
C. neon (Ne)
D. radon (Rn)

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that atomic size of atoms decreases on moving from left to right in a period of the periodic table. Whereas atomic size increases on moving from top to bottom in a group.

Lithium and cesium are both alkali metals. On the other hand, both neon and radon are noble gases.

Both cesium and radon belongs to sixth period. Cesium being at the extreme left side is larger in size than radon which is at the extreme right side of periodic table. Therefore, atomic radius of cesium will be larger than atomic radius of radon.

Whereas both lithium and neon belongs to second period. Lithium being at the top left side of periodic table has larger atomic radius than neon which is at the top right side.

Thus, we can conclude that out of the given options cesium has the largest atomic radius.

A because it has the highest energy level and lowest protons

Which of the following Is true about semi-conductors-neither free eletrons nor hoes are considered charge carriers in a semi-conductor
-exposing a crysal of a semiconductor to heat or light starts displacing valence electrons which then move throughout the crystal
-a material is classified as a semiconductor if its resistance to the flow of electric current is too low to permit it to be called a conductor

Answers

The statement that is true about semi conductors is this: A MATERIAL IS CLASSIFIED AS A SEMI CONDUCTOR IF ITS RESISTANCE TO THE FLOW OF ELECTRIC CURRENT IS TOO LOW TO PERMIT IT TO BE CALLED A CONDUCTOR.

Semi conductors refers to those materials that can conductor electricity only under suitable conditions, their resistance to the flow of electricity lies between that of conductors and non conductors. Semi conductors are usually used in some electric circuits because the flow of electricity through them can easily be controlled. Examples of semi conductors are silicon, germanium and selenium.

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