CHEMISTRY HIGH SCHOOL

The election configuration has of an element is 1s^2 2s^2 2p^1. How many valence electrons does the element have?

Answers

Answer 1
Answer:

Answer:

it has 3 valence electrons

Explanation:

2+2+1 is 5, boron is 5 and its in the 3rd group

Related Questions

A sample of aluminum metal absorbs 8.32 J of heat, upon which the temperature of the sample increases from 23.2 degrees C to 30.5 degrees C. Since the specific heat capacity of aluminum is 0.90 J/g-K, the mass of the sample is what in grams?
Give two reasons why a gold ring is not made of 100% gold.
Help on identifying the solute and solvent
Nuclear Forcesin determining nuclear binding energy, what is Einstein's equation used to do?A)convert energy to mass B)convert joules per nucleus to joules per mole of nuclei C)convert mass to tons D)convert mass to energy
Which of the following is a heterogeneous mixture?A. Oil and Vinegar B. AirC. MilkD. Vinegar in water

How do plants store glucose?

Answers

Hi There!

How do plants store glucose?

Plants often store starch in seeds or other specialized organs! :)

N2 + 3H2 mc033-1.jpg 2NH3 What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3?

Answers

The balanced chemical reaction is:

N2 + 3H2 = 2NH3 

 

We are given the amount of H2 being reacted. This will be our starting point.

26.3 g H2 (1 mol H2 / 2.02 g H2) 2 mol O2/3 mol H2) ( 17.04 g NH3 / 1mol NH3) = 147.90 g O2

 

Percent yield = actual yield / theoretical yield x 100

 

Percent yield = 79.0 g / 147.90 g x 100

Percent yield = 53.4%

Answer:

53.4 percent yield, the fourth option

Explanation:

Which statement describes a chemical property of aluminum?(1) Aluminum is malleable.
(2) Aluminum reacts with sulfuric acid.
(3) Aluminum conducts an electric current.
(4) Aluminum has a density of 2.698 g/cm3 at STP.

Answers

The correct answer as to which statement describes a chemical property of aluminum would be that it reacts with sulfuric acid.

There are two properties of every substance - physical and chemical properties.

Physical properties refer to the characteristics that can be observed without altering the substance while chemical properties refer to the characteristics of undergoing chemical changes in reactions.

Physical properties include color, boiling and melting point, hardness etc., while chemical properties include reactivity, toxicity, flammability, etc.

All the options have to do with physical properties of aluminum except its reactivity with sulfuric acid. The equation of reaction is as follows:

Al + H2SO4 ---> Al2(SO4)3 + H2

More on the chemical properties of aluminum can be found here: brainly.com/question/536562
Aluminium reacts with sulphuric acid.

True or false: physical changes occur when enough energy is released or absorbed from a substance

Answers

I believe it's true. Physical changes occur when enough energy is released or absorbed from a substance.

The combustion of 1 mole of CO according to the reaction CO(g) + ½O2(g) → CO2(g) + 67.6 kcal gives off how much heat?-67.6 kcal
-1,514 kcal
-33.3 kcal
-135.2 kcal
-none of the above

Answers

Combustion usually occurs when a hydrocarbon reacts with oxygen to produce carbon dioxide and water. Combustion reactions are almost always exothermic CO(g) + ½O2(g) → CO2(g) + 67.6 kcal 
base from the reaction, the stoichiometric ratio is 1 mole CO produce 67.6 kcal so the anwer is - 67.6 kcal because is it exothermic

I got 67.6 kcal not -67.6

What do you mean by metallic bond?

Answers

Answer:

_________________________________________________

METALLIC BOND:

Metallic Bond is basically a electrostatic force of attraction between the metal ions which are arranged in a lattice(Lattice is a regular repeating pattern) and the free electrons floating around the metal ions.

_____________________________________

PROPERTIES OF METALLIC BOND:

1- Metals are good conductors of heat and electricity

2- Metals are ductile

3- Metals are malleable

4- Metals are solid at room temperature

5- Metals Possess Metallic luster

_____________________________________
Other Questions
What law determines that chemical equations must be balanced? What does this law say?
Please help brainiest
What is the energy needed to raise an electron in the hydrogen atom from the second energy level to the third energy level ?a.) 1.52x10^4 J  b.) 3.63*10^-19 J  c.) 2.18x10^-19 J d.) 4.48x10^-9 J e.) 3.03*10^-19J
A student views four models showing magnified views of the phases of matter.What question will best help the student determine which model is plasma?AWhich model is composed of rapidly moving particles?B.Which model is composed of particles vibrating in place?CWhich model is composed of electrically charged particles?Which model is composed of particles sliding past each other?