1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Artyom0805 [142]
3 years ago
9

1. An atom of an elephant has atomic mass of 39 and has number of neutrons as 20 calculate protons number.

Chemistry
1 answer:
r-ruslan [8.4K]3 years ago
5 0

Answer:

See Explanation

Explanation:

1) Let us recall that;

Mass number = number of protons + number of neutrons

Where;

Number of protons = ?

Number of neutrons =20

Mass number =39

Number of protons = mass number - number of neutrons

Mass of protons =39 - 20= 19 protons

2) Atomic number = 13

Number of neutrons =14

Then the mass number =13 +14 =27

The symbol of the element is 27X13

The number of protons= the number of electrons =13

The atomic number is the same as the proton number =13

You might be interested in
Which of the following types of equations will include spectator ions
krek1111 [17]

Answer:- B) Full ionic equation

Explanations:- A molecular equation does not have ions. It is the non charge form of the elements of compounds. When we write the full or total ionic equation for the molecular equation then ions are written for the aqueous species. The ions present on both sides(reactant and product sides) in a full ionic equation are known as spectator ions or common ions. These ions are canceled to get the net ionic equation. For example, reaction of aqueous solution of silver nitrate with aqueous solution of barium chloride to form aqueous solution of barium nitrate and a precipitate of silver chloride.

Balanced molecular equation:-

BaCl_2(aq)+2AgNO_3(aq)\rightarrow Ba(NO_3)_2(aq)+2AgCl(s)

Full ionic equation:-

Ba^+^2(aq)+2Cl^-(aq)+2Ag^+(aq)+2NO_3^-(aq)\rightarrow Ba^+^2(aq)+2NO_3^-(aq)+2AgCl(s)

If we look at the above full ionic equation then barium ion and nitrate ions are the spectator ions are they are present on both sides.

So, while writing the net ionic equation, these spectator ions are canceled.

Net ionic equation:-

2Cl^-(aq)+2Ag^+(aq)\rightarrow2AgCl(s)

So, it is also clear from the above example that it's the full ionic equation that include spectator ions.

6 0
3 years ago
Read 2 more answers
When atoms combine they form<br> A. molecules<br> B.periodic table<br> C.particles<br> D.protons
IceJOKER [234]

Answer

A. molecules

Explanation

When atoms or elements combine, they are called molecules. When molecules combine they form compounds.

6 0
4 years ago
(True or false) The water molecule can be either an acid or a base. Justify.
iren [92.7K]

Answer:

TRUE!!!!

Explanation:

Water can act as both an acid and a base in solution and undergoes autoionization, where it can be both an acid and a base to itself. When mixed with an acid, water accepts hydrogen ions and acts as a base. However, when water is mixed with a base, it donates hydrogen ions and acts like an acid.

Not my words! I hope this helps :)

6 0
3 years ago
Read 2 more answers
Each compound listed is soluble in water. For each compound, do you expect the resulting aqueous solution to conduct electrical
Strike441 [17]

Answer:

See below in bold.

Explanation:

a) Yes  because it is an ionic compound. Forms ions in water solution.

b) This is an alcohol with covalent bonds it does not ionise in water - no.

c) Yes this forms ions in water solution.

d) This is a sugar and does not ionise so No.

5 0
3 years ago
The formation of protons over neutrons (thus producing about a 7:1 ratio) was favored in the early universe because:____.
tatiyna

Because it requires more energy to create a neutron from a proton than it does to create a proton from a neutron, protons were formed more frequently than neutrons in the early universe. The correct answer is option b.

To find the answer, we need to know more about the early universe.

<h3>How the formation of proton over neutrons was favored in the early universe?</h3>
  • A neutron is produced with greater energy than a proton.
  • However, later on, some of the protons were changed into neutrons.
  • Contrary to some claims, the proton is a stable particle that never decays, but the neutron is unstable outside of the nucleus and decays with a half life of around 10.5 minutes.
  • However, very few would have had time to decay on the timeline you mention in your question.
  • Every matter particle should have been accompanied by an antimatter particle, and every proton, neutron, and electron, by an anti-neutron and a positron, respectively.
  • Where did all the antimatter go is the great mystery. There have been a few attempts to explain this, but they have failed.

Thus, we can conclude that, the correct answer is option b.

Learn more about the early universe here:

brainly.com/question/28130096

#SPJ1

7 0
2 years ago
Other questions:
  • Water, H2O, is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to shared __________
    6·2 answers
  • Who was the first to state the concept of an atom?
    14·2 answers
  • What is the density of lead if a piece of Lead 1 cm by 20 cm by 30 cm has a mass of 6800 grams
    14·1 answer
  • What energy transform occours in a genorator
    6·2 answers
  • A voltaic cell is constructed in which the following cell reaction occurs. The half-cell compartments are connected by a salt br
    15·1 answer
  • Calculate [H 3 O+] of a solution with the ph of 3.45
    7·1 answer
  • Which statement best describes comparative and descriptive investigations?
    10·2 answers
  • student desing an experiment to see if the thermo energy is transfer at the same rate in different liquids the students safely h
    6·1 answer
  • PLEASE HURRY
    8·1 answer
  • The mass of 25 cm 3 of brass is 210 g calculate the density of brass​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!