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3 years ago

Which two particles are found in the nucleus of an atom?

2 answers:

7 0

Answer:

Protons and neutrons are found in the nucleus of the atom.

Explanation:

Protons and neutrons are found in the nucleus of the atom, while electrons are outside of the nucleus.

max2010maxim [7]3 years ago

4 0

Answer:

Protons and neutrons

Explanation:

Nucleus is the central dense part of the nucleus and consists of most of the mass of an atom.

An atom has three subatomic particles:

Electrons
Protons
Neutrons

Electrons are negatively charged subatomic particles, protons are positively charged and neutrons are neutral.

Electrons are present in the energy shells outside to the nucleus and revolve around it.

Protons and neutrons are present in nucleus.

Number of protons and neutrons present in the nucleus together called mass number or atomic mass.

Therefore,

Atomic mass = No. of protons + No. of neutrons

Number of protons present in the nucleus is same as the number of electrons present outside nucleus.

Therefore,

No. of protons = No. of electrons = Atomic number

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A boron atom has ____ electrons at the first energy level and ____ electrons at the second energy level.

mylen [45]

Answer: A boron atom has 2 electrons at the first energy level and 3 electrons at the second energy level.

5 0

3 years ago

Which of these pairs would form an ionic bond? K and Br

ZanzabumX [31]

is there any other pairs

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3 years ago

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50 pts! Please help, much appreciated (:

Korolek [52]

Answer:

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3 years ago

9. Elements that are characterized by the filling of p orbitals are classified as

Bogdan [553]

Answer:

p block elements

Explanation:

6 0

3 years ago

200.0 mL of 3.85 M HCl is added to 100.0 mL of 4.6 M barium hydroxide. The reaction goes to completion. What is the concentratio

Ede4ka [16]

Answer:

2.387 mol/L

Explanation:

The reaction that takes place is:

2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O

First we calculate how many moles of each reagent were added:

HCl ⇒ 200.0 mL * 3.85 M = 203.85 mmol HCl

Ba(OH)₂ ⇒ 100.0 mL * 4.6 M = 460 mmol Ba(OH)₂

460 mmol of Ba(OH)₂ would react completely with (2*460) 920 mmol of HCl. There are not as many mmoles of HCl so Ba(OH)₂ will remain in excess.

Now we calculate how many moles of Ba(OH)₂ reacted, by converting the total number of HCl moles to Ba(OH)₂ moles:

203.85 mmol HCl * $\frac{1mmolBa(OH)_{2}}{2mmolHCl}$ = 101.925 mmol Ba(OH)₂

This means the remaining Ba(OH)₂ is:

460 mmol - 101.925 mmol = 358.075 mmoles Ba(OH)₂

There are two OH⁻ moles per Ba(OH)₂ mol:

OH⁻ moles = 2 * 358.075 = 716.15 mmol OH⁻

Finally we divide the number of OH⁻ moles by the total volume (100 mL + 200 mL):

716.15 mmol OH⁻ / 300.0 mL = 2.387 M

So the answer is 2.387 mol/L

7 0

3 years ago