Which statement best describes visible light?

How do scientists determine the number of neutrons in an isotope of an atom? O They find the number of protons. 0 They add the n

Elza [17]

Answer:

The three naturally-occurring isotopes of hydrogen. The fact that each isotope has one proton makes them all variants of hydrogen: the identity of the isotope is given by the number of protons and neutrons. From left to right, the isotopes are protium (1H) with zero neutrons, deuterium (2H) with one neutron, and tritium (3H) with two neutrons.

The term isotope is formed from the Greek roots isos (ἴσος "equal") and topos (τόπος "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.[2] It was coined by a Scottish doctor and writer Margaret Todd in 1913 in a suggestion to chemist Frederick Soddy.

The number of protons within the atom's nucleus is called atomic number and is equal to the number of electrons in the neutral (non-ionized) atom. Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons. The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.

For example, carbon-12, carbon-13, and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13, and 14, respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7, and 8 respectively.

4 0

3 years ago

Butters can jump 5.5 feet. How many inches can he jump? (12 in = 1 ft)

olchik [2.2K]

Answer:66

Explanation:

5.5 feet is 66 inches

7 0

3 years ago

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What is scientific method

morpeh [17]

Answer:

a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

Explanation:

a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

8 0

3 years ago

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On your first day working in a laboratory, you are told to make up 1 Liter of a 0.5 Molar Tris solution with a pH of 7.4. You me

GenaCL600 [577]

Answer:

60.57g of TRIS did you use

Explanation:

The concentration of the Tris solution buffer is 0.5 molar (That is, 0.5 moles per liter). As you need to make 1L, you need to have in the solution <em>0.5 moles of TRIS.</em>

<em />

To convert these moles of TRIS to grams you need to use the molecular weight of TRIS base (121.14g/mol), thus:

0.5 moles TRIS * (121.14g / mol) =

7 0

3 years ago

!!!PLEASE HELP ME WITH THIS!!! WILL MARK AS BRAINLIEST AND WILL GIVE 30 PTS!! PLEASE ANSWER HONESTLY, DON"T ANSWER JUST TO GET P

alexandr402 [8]

1. Balanced Equation of the Reaction is as follow,

2 HgO ---------> 2 Hg + O₂

2. The arrow labelled as a indicate ACTIVATION ENERGY. It is the minimum amount of energy required by the reactants to convert into products. This energy is obtained by providing heat to the system.

3. Transition State or Activated Complex:
I am trying to draw possible transition state. It could be the correct one and can be confirmed by theoretical computational study.

Hg------O------O------Hg

Here the dashed lines mean that the bond between Hg and O are breaking and their length is increasing and the dashed line between oxygen atoms depict that the bond length is decreasing and bond formation is taking place.

4. This reaction is Endothermic because the energy of reactants is smaller than the energy of products. So, the difference in energies is obtained by providing heat to the system.

Note: I have answered these questions with respect to following energy profile.

4 0

4 years ago