i need help please........

Answer:

The cause of periodicity in properties is the repetition of similar outer electronic configuration after certain regular intervals. For example, all the elements of group 1 i.e. alkali metals have a similar outer electronic configuration, ns1.

Answer:

gkfbhs DC hdshgagfzh

Answer:

0.75 cm

Explanation:

You will convert 1.07 carat into mg then into g. You will multiply its reciprocal by 3.51g/cm to get the answer.

Answer:

yes it is c=mxb okay

Explanation:

Answer:

Explanation:

cant see the screen really

Answer:

carbon-14

Explanation:

becouse protons and neutrons are nagetivly charged

Answer:

sorry but I don't understand Spanish

otherwise I will definitely helps you

I don't understand Spanish but you can do this :)

Answer:  Ga, P,Cl, F

Explanation:  

Cl 1314  kJ/mole

F 1681  kJ/mole

Ga 579  kJ/mole

P 1012  kJ/mole

Answer:

four covalent bonds

Explanation:

Answer: four covalent bonds

Explanation:

Answer:

Hey mate.....

Explanation:

This is ur answer.....

Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.

Hope it helps!

Brainliest pls!

Follow me! :)

Answer :

a chemical equation in

which the electrolytes in aqueous

solution are expressed as dissociated

ions.

Have good day !!

Answer:

Theory.

Explanation:

It is called a theory.

Answer:

I don't know

Explanation:

is today your test

Answer:

b be a pure substance

Explanation:

Answer:

a

Explanation:

everything can be broken down to a smaller less useful compounds but never destroyed

Answer:

Both.

Explanation:

In decomposition, two processes occur. Firstly, because of chemical change the colour of the top layer is transformed. And secondly, due to first reaction it turns into bark and it's a physical change.

So both the changes are the part of decomposition reaction.

The decomposition of the bark of fungi is a chemical change. So the correct option is A.

The word decomposition literally means “to break down”. The process usually relates to the disintegration of the complex organic matter into a simpler inorganic matter. It is a very significant and essential process of the ecosystem.

Hence, decomposition is a metabolic process, performed by living organisms. They take up raw materials in the form of complex compounds, turn process and then convert it into simpler compounds.

Bacteria, fungi, and a few other microorganisms are known as decomposers and they can initiate the process of decomposition. They survive on dead organisms by feeding on them.

The dead and decaying animals and plants are able to serve as raw materials. Upon their breakdown, they produce nutrients, carbon dioxide, water, etc. Dead animals, plants, and their remains are called detritus. This detritus is used by plants and are collectively known as saprophytes.

Therefore, the correct option is A.

Read more about decomposers, here

https://brainly.com/question/896544

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Answer:

Claim: It is an answer to your question

Explanation:

Answer:

1s22s22p63s23p64s23d9

Explanatihe neutrlon:

Tell electronic configuration of Copper? ​

Copper is atomic # 29 so it has 29 protons.

The neutralatom must have 29 negative charges to balance the 29

positive charges, so it has 29 electrons.

Our electron configuration must account for all 29 electrons

Look at a Periodic Table

cture from

find copper #29

let us  "AUF-BAU"  ( buld up) the copper electronic configuration from the Periodic Table.copper #29 is in th 4th row.

To "build up", start at row 1.  this is the 1st energy level.  there are noly 2 elements H and He, so it is only an "s" robital. with 2 e's.  so

1s2ve 2 e's in an s orbital and 6 in p orbitals,

at row 2 (energy level 2) we have 2 e's in an s orbital and 6 in p orbitals, so

building on top of row 1, we have

1s22s22p6

at row 3 we repeat and so have

1s22s22p63s23p6

at row 4 we start with 2 e in an s orbital at the 4th energy level, so we

have

1s22s22p63s23p64s2

we now enter the d orbtals, and copper has 9 electrons in the d orbitals.  

but these d orbitals are only slightly at energy level 4.  because of their more complex shape, most of the orbital is in the 3rd energy level, so

we buld up for copper, #29

1s22s22p63s23p64s23d9

count the electrons and add them:

2 + 2 +6 +2 +6 +2 +9 = 29  copper's number

Answer:

264.7

Explanation:

26470 cm = 264.7 m

just move the decimal over two spaces.

answer/

1 grams Calcium Phosphate to mol = 0.00322 mol

no. of moles= 0.00322×25

no. of moles = 0.0805

Answer:

A. The product formed have more energy than the reactants.

This is because it is an endothermic reaction.

[tex].[/tex]

Answer:

Large-scale nuclear is fission a rare phenomenon on Earth because

atoms that undergo fission aren't concentrated enough to sustain a chain reaction.

Answer:

Atoms that undergo fission aren't concentrated enough to sustain a chain reaction. For example, the decay chain of U-238 is called the uranium series. ... Uranium is find in ores on Earth with very law mass percentage in it, so fission is not possible

Answer:

magnesium chloride: MgCl2

zinc sulphide: ZnS

sodium sulphate: Na2SO4

calcium bicarbonate: Ca(HCO3)2

Answer:

so here is the answer (What kind of a question my freind

Explanation:

Graham crackers are a whole wheat sweet cookie used in baking and making S'mores. Did you know that Graham crackers are called that because they're made from Graham Flour? It's a flour similar to conventional whole wheat flour in that both are made from the whole grain, but Graham flour is ground more coarsely.

Answer:

Explanation:

I don't know how you want the conversion done. I use dimensional analysis.

Jane

12 miles / hour [1.6 km/1 mile][1000 m/1 km][1 hour / 3600 sec]

12 * [1.6 * 3600 / 1000  m/s] = 69.12 m/s

5.33 m/s      This answer is a bit shorter than using 5280 feet.

Using 5280 feet

12 miles / hour [5280 ft/1 mile] [1 m/3.281 feet] * [1 hr/3600 sec]

12 * 5280 / (3.281 * 3600)

12 *. 4470

5.36

Jack

330 feet / minute [ 1 meter / 3.281 feet] [1 minute / 60 seconds]

330 * 1/(3.281 * 60)

330 * 1/(196.86)

1.676 m/s

She's going faster than he is, no matter which method is used to do the calculation

Answer:

molecular formula = molar mass ÷ empirical formula

n = 142 ÷ 142

n = 1

molecular formula (P2O5)1 = P2O5

Answer:

Density is 2.7 g/ml³

Explanation:

[tex]density = \frac{mass}{volume} \\ [/tex]

mass » 13.5 g

volume » 5 ml³

[tex]density = \frac{13.5}{5} \\ \\ = 2.7 \: {g \: ml}^{ - 3} [/tex]

Answer:

[tex]\boxed {\boxed {\sf 2.7 \ g/mL}}[/tex]

Explanation:

Density is a substance's mass per unit volume. The formula for calculating density is as follows.

[tex]\rho= \frac{m}{v}[/tex]

The mass of the rock is 13.5 grams and the volume of the rock is 5 milliliters.

Substitute these values into the formula.

[tex]\rho= \frac{13.5 \ g}{5 \ mL}[/tex]

Divide.

[tex]\rho= 2.7 \ g/mL[/tex]

The density of the rock is 2.7 grams per milliliter.

Answer:

How to Convert a Number to Standard Form

Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. ...

Count how many places you moved the decimal point. ...

Write your scientific notation number as a x 10b and read it as "a times 10 to the power of b."

Explanation: