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3 years ago

How does one determine the number of core electrons an atom has?

Chemistry

2 answers:

scoundrel [369]3 years ago

4 0

Answer: Subtract the number of valence electrons(outer most shell electrons) from the atomic number of an atom.

Explanation: The total number of electrons for an atom equals to its atomic number. Electrons are present in different shells. Electrons present in outer most shell(valence shell) are known as valence electrons and rest of the electrons present in inner shells are known as core electrons.

So, to determine the number of electrons we subtract the valence electrons from atomic number.

For example, atomic number of N (nitrogen) is 7. It has 5 valence electrons.

Number of core electrons for N = 7 - 5 = 2

Aleonysh [2.5K]3 years ago

3 0

Subtract the group number from the atomic number.

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3. What causes hydrogen bonding?

Fudgin [204]

Hydrogen bonding occurs between a hydrogen atom and an electronegative atom (e.g., oxygen, fluorine, chlorine). The bond is weaker than an ionic bond or a covalent bond, but stronger than van der Waals forces (5 to 30 kJ/mol). A hydrogen bond is classified as a type of weak chemical bond.

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3 years ago

Read 2 more answers

Claire is investigating potential and kinetic energy using a large ball. For her investigation, Claire will stand at the top of

uranmaximum [27]

The ball's potential energy will decrease, and its kinetic energy will increase.

Explanation:

The ball's potential energy will decrease down the slope and its kinetic energy will increase.

Kinetic energy is the energy due to the motion of a body.

K. E = $\frac{1}{2}$ m v²

m is the mass of the ball

v is the velocity of the ball.

Potential energy is the energy due to the motion of a body down slope.

It is expressed as:

P.E = mgh

m is the mass of ball

g is the acceleration due to gravity of the body

h is the height.

We can see as the body drops down the slope, the height diminishes and the velocity increases.

learn more:

Potential energy brainly.com/question/10770261

#learnwithBrainly

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3 years ago

So de fanga gu se si gage humang we sapa shata phoni we heo sang pai

PilotLPTM [1.2K]

Answer:

Which language is this???

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3 years ago

What is the total energy change for the following reaction: CO + H2O -> CO2 + H2?

liubo4ka [24]

1)Delta H=(Delta H of reactants)-(Delta H of products)

2)And we know CO have 3 bond CO and CO2 have 2 bond that each of them are 2 bond, please see the picture!

so lets answer it:

$(3 \times 358) + (2 \times 463) - (4 \times 358) - 436 = 132$

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3 years ago

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If you start a chemical reaction with 5 atoms of hydrogen, how many hydrogen atoms will you have when it is finished? Group of a

mote1985 [20]

Answer:

5 atoms

Explanation:

According to the law of conservation of mass, "matter is neither created nor destroyed in the cause of a chemical reaction".

We finish with what we start with in a chemical reaction. Although new species might form, the number of atoms on both sides of the expression will still be maintained.

All chemical reactions obey this law of conservation.

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3 years ago