CHEMISTRY HIGH SCHOOL

Pls help i need the Formula how can you calculate the number of electrons present in a shell?​ pls help!!! will give brainliest

Answers

Answer 1
Answer:

Answer:

The maximum number of electrons present in a particular shell is calculated by the formula 2n2, where “n” represents the shell number. For instance, K shell is the first shell and it can hold up to 2(1)2 = 2 electrons. Similarly, L shell is the second shell and it can hold up to 2(2).

Related Questions

Classify wine and beef stew as homogeneous or heterogeneous.
Which of the following reactions produce oxygen gas? Anaerobic respiration Photosynthesis Aerobic respiration Fermentation
Which term defines the amount that a solute can dissolve into a solution? A. solute level B. solution level C. solubility level D. saturation level
Which sample of matter is a mixture? (1) Br2(ℓ) (3) KBr(s) (2) K(s) (4) KBr(aq)
A gas contains a mixture of NH3(g) and N2H4(g), both of which react with O2(g) to form NO2(g) and H2O(g). The gaseous mixture (with an initial mass of 61.00 g) is reacted with 10.00 moles O2, and after the reaction is complete, 4.062 moles O2 remains. Calculate themass percent of N2H4(g) in the original gaseous mixture.

Explain how engineers and scientists may work together to produce a protein in the lab.

Answers

Scientists would deal with the aspect of cloning a particular gene into a bacterium or making of hybridoma cells that will produce the particular required protein. Engineers will then design and develop a bioreactor which is a programmed instrument that avails the required substances to the cells/bacteria in specific amounts and at particular time periods to grow and reproduce the cells in large amounts.

the scientists would do biological studies of how the protein breakdown and combines with the muscles the engineers with then create a delivery system to get the protein to the muscle quicker and more effectively

What coefficients must be added to balance the following reaction __Sn+___H3PO4___=H2+___Sn3(PO4)4

Answers

answer 3Sn+ 4H3pO4= 6H2+Sn(PO)4

1 Sn                                  3 Sn
3 H                                    2 H
1 P                                    4 P
4 O                                    16 O
 then you have to make the numbers the same for each side

so you get by putting the 3 infront of Sn 4 infront of the H3PO4  and 6 infront of the H2
3 Sn                                   3 Sn
12 H                                    12 H
4 P                                      4 P
16 O                                     16 O

Which elements can react to produce a molecular compound?(1) calcium and chlorine
(2) hydrogen and sulfur
(3) lithium and fluorine
(4) magnesium and oxygen

Answers

 The  elements that can react  to produce a molecular  compound is  hydrogen  and sulfur

Explanation

  • A  molecular compound is   formed  when two or more atoms join by  sharing  electrons through  a  covalent  bond.  
  • Sharing of atoms  occurs  mainly  between non metals.

  • Hydrogen ( a non metal)  and sulfur(a non metal) react to form  a molecular compound  by sharing electron among themselves.
  • 2 hydrogen  atom   bond  with 1 atom sulfur  to form hydrogen sulfide.

\boxed{\left( 3 \right){\text{ Hydrogen and sulfur}}} can react to produce a molecular compound.

Further Explanation:

Covalent or molecular bond is formed when two or more non-metals share electrons between them. Such electron pairs are called bonding or shared pairs. The compounds formed as a result of these bonds are called covalent or molecular compounds.

Covalent bonds can be a polar covalent or nonpolar covalent bond. The bonds formed as a result of electron sharing between the atoms having some electronegativity difference between them are polar covalent bonds. HCl shows such type of bonding in it. The bonds formed when electrons are shared between the bonded atoms and these have no or slight difference in their electronegativities are called nonpolar covalent bonds. The bonds present in a \text{CH}_4 molecule are nonpolar covalent bonds.

Another type of bonding that occurs due to the complete transfer of electrons from one atom to the other is called ionic bonding. Such a process includes the formation of charged species called ions. Ions can have positive or negative charges on them. The charged species having a positive charge are cations while those having negative charges are anions.

(1) Calcium and chlorine

Calcium belongs to group 2A of the periodic table and is highly electropositive in nature. So it loses two electrons and forms \text{Ca}^(2+). Chlorine is highly electronegative in nature so two chlorine atoms accept the electrons donated by calcium and forms \text{Cl}^- ions. Therefore \text{CaCl}_2 is formed which is an ionic compound.

(2) Hydrogen and sulfur

Both these atoms are nonmetals. So they share electrons with each other and as a result, a covalent or molecular compound is formed.

(3) Lithium and fluorine

Lithium belongs to group 1A of the periodic table and is highly electropositive in nature. So it loses an electron to form \text{Li}^+. Fluorine is highly electronegative in nature and therefore it accepts the electrons donated by lithium and forms \text{F}^-. Therefore LiF is formed which is an ionic compound.

(4) Magnesium and oxygen

Magnesium belongs to group 2A of the periodic table and is highly electropositive in nature. So it loses two electrons and forms {\text{M}}{{\text{g}}^(2 + )}. Oxygen is highly electronegative in nature so it accepts the electrons donated by magnesium and forms {{\text{O}}^(2 - )}. This results in the formation of MgO which is an ionic compound.

Therefore a molecular compound is formed when hydrogen and sulfur react with each other.

Learn more:

  1. What is a typical characteristic of an ionic compound? brainly.com/question/6071838
  2. What type of bond exists between phosphorus and chlorine? brainly.com/question/81715  

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords: covalent bond, molecular bond, cations, anions, calcium, chlorine, hydrogen, sulfur, lithium, fluorine, magnesium, oxygen, molecular compound, ionic compound.

A 0.20-Molar solution of K2CO3 is a better conductor of electricity than a 0.20-Molar solution of KBr. Which of the following BEST explains this observation between the two solutions. *

Answers

Answer:

K2CO3 dissociates more ions than Kr

Explanation:

A solution conducts electricity because of much supply of ions an example is strong electrolytes. A solution contains both positive and negative ions and the ability of these ions to move freely allows them to carry positive and negative charges thereby conducting electricity. A solution such as K₂CO₃ dissociates more ions than KBr, therefore it is a better conductor of electricity. Neutral solutions do not conduct electricity.

An element, X, has 2 isotopes, X-32 with an abundance of 31.5% and X-35 with an abundanceof 68.5%. What is the average atomic mass of element X?

Answers

Answer:

amu = 34.055 or 34.1

Explanation:

to calculate the average mass, first convert the percentages into decimals. Then, calculate the mass numbers. To get this number, multiply the decimal by the mass number for each isotope and, then add them together.

( 0.315 x 32 ) + (0.685 x 35 ) = 34.055

Table salt, NaCl, is an example of an amorphous solid.
TRUE
FALSE

Answers

Answer:

False

Explanation:

Before answering the question, it is important to understand;

An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Emphasis on the word noncrystalline.

Table salt on the other hand is an ionic solid made up of Ions of opposite charges (Sodium ion and Chlorine ion) strongly attract each other; those of like charges repel. As a result ions in an ionic compound are arranged in a particular manner.

The ions in NaCl are ordered hence are referred to as crystalline solids  and not amorphous.
False, it is an example of an Ionic solid
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