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
Inessa05 [86]
3 years ago
10

If an isotope of an element has 40 neutrons and a mass number of 79, how many electrons must it have?

Chemistry
1 answer:
34kurt3 years ago
5 0

Answer: 39 electrons

Explanation: Subtract 79 by 40 to get the atomic number (amount of protons) which is 39. The number of electrons must be the same as the number of protons if it's not an ionic compound so the amount of electrons is the same amount of protons.

You might be interested in
A solution contains 0.140 mol KCl in 2.100 L water. What is the concentration of KCl in g/L?
viva [34]
<h3><u>Answer</u>;</h3>

≈ 4.95 g/L

<h3><u>Explanation;</u></h3>

The molar mass of KCl = 74.5 g/mole

Therefore; 0.140 moles will be equivalent to ;

 = 0.140 moles × 74.5 g/mole

 = 10.43 g

Concentration in g/L

   = mass in g/volume in L

   = 10.43/2.1

   =  4.9667

<h3>   <u> ≈ 4.95 g/L</u></h3>
4 0
3 years ago
What is Industrial chemistry?​
mel-nik [20]

Answer:

study of chemical used in industries

6 0
2 years ago
Why the stability of No+ is greater than No?
lyudmila [28]
Because of the protons connected to the Nitrogen oxide group giving it its positive charge.
7 0
2 years ago
(Chemistry) Match each item with the correct statement below.
Colt1911 [192]

Number\;1:\;Formula.\\\\Number\;2:\;Solution\\\\Number\;3:\;Chemistry\\\\Number\;4:\;Solute\\\\Number\;5:\;Mass\\\\Number\;6:\;Matter\\\\Number\;7:\;Alloy\\\\Number\;8:\;Aqueous\\\\Number\;9:\;Quantitative

4 0
2 years ago
A 20 N object is placed on a surface and starts to slide. What is the MOST likely reason the object begins to move?
ra1l [238]

Answer:

c.

Explanation:

If the object starts to slide it must be on a slope.

There are 2 forces acting on the object - gravity and the friction between the object and the surface.

If sliding starts then the forces must be unbalanced.

The force of gravity is greater than the friction.

8 0
2 years ago
Other questions:
  • Which of the following is an example of a polymer?
    9·1 answer
  • When a chemical reaction occurs, atoms rearrange to form new compounds, but no new atoms are created nor are any destroyed. this
    13·1 answer
  • Hydrogen bonds are
    13·1 answer
  • Uranium has 146 neutrons; therefore its mass number is which of the following?
    12·2 answers
  • How many moles of sodium bicarbonate are in 1.50 kg of the compound?
    14·1 answer
  • The Lewis structure for a chlorate ion, ClO3-, should show ____ single bond(s), ____ double bond(s), and ____ lone pair(s).
    15·2 answers
  • 20.0 g of Nitrogen is produced when oxygen gas reacts with NO gas. 29.8 L of oxygen is required at STP to produce this 20.0 g of
    11·1 answer
  • What is the energy of an electromagnetic wave with a frequency of 8 x 10^12
    15·1 answer
  • given a mixture of lead to oxide ammonium chloride and sodium chloride describe how a mixture can be separated to obtain a sampl
    8·1 answer
  • State which separation method you would use to separate potassium iodine solution​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!