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3 years ago

An element's atomic number is 68. How many protons would an atom of this element have?

2 answers:

7 0

The answer would be 68. The atomic number will signify the number of protons in an element so if the atomic number is 68, then the number of protons is 68 and the number of electrons is also 68 in order to maintain a nuclear charge.

Evgen [1.6K]3 years ago

4 0

Answer: 68.

Explanation:

The atomic number is the number that idenfities an element.

The atomic number is the number of protons of an element.

Every element has a different number of protons.

The elements are arranged in the periodic table as per their atomic number (number of protons).

The first element is hydrogen (H), its atomic number is 1, and it has 1 proton.

The second element is helium (He), its atomic number is 2 (it has 2 protons)-

Those two elements form the first period (row) of the periodic table.

The second row (period) has the elements Li, Be, B, C, N, O, F and Ne, whose respective atomic numbers (number of protons are) 3, 4, 5, 6, 7, 8, 9, and 10, respectively.

And so, you may idenfity each of the 118 elements known, with a different atomic number (number of protons).

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A light strikes the boundary of a medium at a 45 degree angle. Instead of entering the second medium, the light reflects back in

Dahasolnce [82]

Answer:

D It must be equal to 1.00

Explanation:

The refraction in the second medium must be equal to 1. The refraction index is given as the ration of the angle of incidence to the angle of refraction. This is given as a fraction. In other words:

$\frac{sin\theta _{i} }{sin\theta _{r} } = n$

where Θ₁ and Θ₂ are angles of incidence an refraction, and n is the refractive index.

At a critical angle, the refraction is equal to the reflection inside the medium. This results in a phenomenon called total internal reflection where light is reflected internally in the medium.

6 0

3 years ago

At 700 K, CCl4 decomposes to carbon and chlorine. The Kp value for the decomposition is 0.76. Find the starting pressure of CCl4

Vladimir79 [104]

The decomposition of CCl4 is as follows:

CCl4 (g) ---> C(s) + 2Cl2 (g) Kp = 0.76

where Kp = (PCl2)^2 / (P_CCl4)

P_C is zero since carbon is in solid form.

Express P_CCl4 in terms of P_Cl2

0.76 = (P_Cl2)^2 / (P_CCl4)

0.76P_CCl4 = (P_Cl2)^2

Ptotal = P_Cl2 = 1.9 atm

Solve for P_CCl4

P_CCl4 = 4.75 atm

6 0

4 years ago

The combination of oxygen with other substances to produce new chemical products is called

Flauer [41]

Answer:

The combination of oxygen with other substances to produce new chemical products is called Oxidation.

Explanation:

Oxidation reactions are defined as,

In terms of Inorganic chemistry:

(i) Removal of Electrons:

Example: Mg → Mg²⁺ + 2 e⁻

(ii) Addition of Oxygen:

Example: 2 Mg + O₂ → 2 MgO

In terms of Organic chemistry:

(i) Addition of Electrons:

Example: Cl₂ + 2 e⁻ → 2 Cl⁻

(ii) Addition of Hydrogen:

Example: H₂CCH₂ + H₂ → H₃CCH₃

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3 years ago

50.0 grams of water vapor at STP occupies how much volume?

oksian1 [2.3K]

Answer:

22.4 L

hope it will help you

6 0

3 years ago

Silver nitride is formed when a silver cation that has a 1+ charge combines with a nitrogen anion that has a 3- charge. Write th

eimsori [14]

Silver's chemical symbol is Ag, and it has a 1+ charge. Nitrogen's chemical symbol is N, and it has a 3- charge. For silver and nitrogen to form a compound, their charges must cancel out to zero. Therefore, we would need 3 silver atoms for each nitrogen atom to balance the charges out. The formula for the silver nitride compound would be Ag3N.

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3 years ago