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Alona [7]
3 years ago
15

Based on silicon's position on the periodic table, it has

Chemistry
2 answers:
pashok25 [27]3 years ago
6 0

Answer: A. 14 electrons, which include 4 valence electrons in the third energy level and 10 electrons distributed over the first two energy levels.

Explanation:

Silicon is an element with atomic number 14 and thus contain 14 electrons. It is a p block element as the last electron enters the p orbital. The nearest noble gas is neon with 10 electrons.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration in terms of noble gs configuration is:  

Si:14:1s^22s^22p^63s^23p^2

The valence electrons are the electrons present in last shell i.e n= 3, thus there are 4 valence electrons, 8 electrons in n= 2 and 2 electrons in  n= 1 energy level. Thus total of 10 electrons in first two energy levels.

monitta3 years ago
5 0
A. 
The first energy level has 2 electrons, the second has 8, and the third has 4
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Which best explains why water is able to “stick” to the side of glass?
AveGali [126]

Explanation:

Adhesion means the ability to stick on the surface of another substance.

Water exhibits adhesive forces due to which it is able to stick to the glass.  Due to adhesive forces water spreads over the surface of glass and sticks to it.

These adhesive forces between the glass and water enough that it deforms the spherical shape of water molecules and help them stick to the surface of glass. As a result, adhesive forces overcome the repulsion between like molecules.

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4 0
3 years ago
Read 2 more answers
4 Na + O2 → 2 Na2O<br><br> 6.79 moles of O2 will react to form how many moles of Na2O?
Nataly_w [17]

Answer:

13.94moles of Na₂O

Explanation:

The balanced reaction expression is given as:

        4Na  +  O₂  →   2Na₂O

Given parameters:

Number of moles of O₂ = 6.97moles

Unknown:

Number of moles of Na₂O

Solution:

 To solve this problem;

            1 mole of O₂  will produce 2 moles of Na₂O ;

            6.97 moles of O₂ will produce 6.97 x 2  = 13.94moles of Na₂O

6 0
2 years ago
What is another name for the heat involved in a reaction?
wlad13 [49]

There is your answer

4 0
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3. How many formula units of NaOH are in 0.87 moles?
Lady_Fox [76]

Answer: 1 mole of H2O= about 1/3 of a cup (18 mL). It is helpful ... 6.02 x 1023 H2O molecules. = 6.02 x 1023 NaCl formula unit. 1 mole C. 1 mole H2O. 1 mole

Explanation:

5 0
2 years ago
Ionic compounds are typically between a​
barxatty [35]
It starts with a cation and ends with a nonmetal anion. To recap, cations are your positively charged elements and anions are negatively change and usually with the ending “ide”. For example, potassium a metal and chlorine a nonmetal (KCl) would form the word potassium chloride.
8 0
3 years ago
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