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Llana [10]
3 years ago
13

Which of these items best describes the arrangement of electrons in an atom of sulfur? A. Eight electrons in its first energy le

vel; eight valence electrons in its outermost shell B. Two electrons in its first energy level; two electrons in its second energy level; eight electrons in its third energy level; four valence electrons in its outermost energy level C. Two valence electrons in its first energy level; eight electrons in its second energy level; six electrons in its outermost energy level D. Two electrons in its first energy level; eight electrons in its second energy level; six valence electrons in its outermost energy level
Chemistry
2 answers:
Serga [27]3 years ago
6 0

D. Two electrons in its first energy level; eight electrons in its second energy level; six valence electrons in its outermost energy level.

Please correct me if I'm wrong!! :)


Ivenika [448]3 years ago
6 0

<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.

Sulfur is the 16th element of the periodic table having 16 electrons. The electronic configuration of this element is: 1s^22s^22p^63s^23p^4

The number of electrons in first shell (n = 1) : 2

The number of electrons in second shell (n = 2) : (2 + 6) = 8

The number of electrons in third shell, outermost shell (n = 3) : (2 + 4) = 6

The number of valence electrons in sulfur atom are 6

Hence, the correct answer is Option D.

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Which elements have two valence electrons?
lora16 [44]

Answer:

Magnesium

Explanation:

Magnesium is in group 2 of the periodic table. The group in which an element is found in tells us the number of valence eletrons it has.

HOPE THIS HELPED

7 0
3 years ago
Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. (1.8 x 1
slamgirl [31]

Answer : The answer is, 0.2\times 10^{-4}

Explanation :

Scientific notation : It is defined as the way or representation of expressing the number that are too big or too small that is written in the decimal form. That means always written in the power of 10 form.

For example : 8000 is written as, 8.0\times 10^3  in this notation, the significant figure is, 1 but 0.8\times 10^4  in this notation, the significant figures are, 2

The given problem are :

\frac{1.8\times 10^{-2}}{9\times 10^2}=0.2\times 10^{-4}

According to the divide and multiplication rules of scientific figures, the final answer is only as precise as the value with the least number of significant figures.

Hence, the answer is, 0.2\times 10^{-4}

6 0
3 years ago
Read 2 more answers
What term is best associated with protons or neutrons escaping to become more stable?
Gre4nikov [31]
The correct answer is C
3 0
3 years ago
Chemical element that has atomic number less than 58 and atomic mass greater than 135.6
tatyana61 [14]

A chemical element that has an atomic number less than 58 and an atomic mass greater than 135.6m is barium (atomic no. 56 and atomic mass137.13 ) and lanthanum (atomic no. 57  and atomic mass 135.6).

<h3>Give a brief introduction about Barium and Lanthanum.</h3>
  • Barium

Barium is an element with the symbol Ba and atomic number 56. It is an alkaline earth metal that is soft and silvery, and it is the fifth element in group 2. Barium is never found in nature as a free element due to its extreme chemical reactivity. Oil well drilling fluid uses barium sulfate as an insoluble ingredient. It is employed as an X-ray radiocontrast agent in a purer form to image the human gastrointestinal tract. Barium compounds that dissolve in water have been employed as rodenticides despite being hazardous.

  • Lanthanum

Chemical element lanthanum has the atomic number 57 and the symbol La. It is a silvery-white, ductile, soft metal that slowly tarnishes when exposed to air. It serves as the eponym for the group of 15 related elements in the periodic table between lanthanum and lutetium, of which lanthanum is the first and prototype. The rare earth elements traditionally include lanthanum.

Learn more about elements here:-

brainly.com/question/6335008

#SPJ9

4 0
2 years ago
What sublevels are contained in the hydrogen atoms first four energy levels what orbitals are related to each?
erik [133]
1st level = s 
<span>2nd level = s,p </span>
<span>3rd level = s,p,d </span>
<span>4th level = s,p,d,f</span>
6 0
3 years ago
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