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
STatiana [176]
2 years ago
11

How many neutrinos does an element have if it's atomic number is 47 and it's mass number is 169

Chemistry
1 answer:
Stells [14]2 years ago
7 0

This element would have 122 neutrons.

Atomic mass is the accumulation of neutrons and protons.

169 - 47 = 122.

Therefore, there are 122 neutrons.

You might be interested in
Most substances can exist as a solid, liquid, or gas depending on ? ( science
earnstyle [38]

Answer:

The amount of energy in molecules of matter determines the state of matter.

Explanation:

The amount of energy in molecules of matter determines the state of matter. Matter can exist in one of several different states, including gas, liquid, or solid-state.

3 0
2 years ago
Read 2 more answers
What is the main energy conversion that occurs when you plug in a lamp
MrRa [10]
Elecrtical or Radiantal 
4 0
3 years ago
Read 2 more answers
Can anyone help me on this please?
Bad White [126]
This question is testing to see how well you understand the "half-life" of radioactive elements, and how well you can manipulate and dance around them.  This is not an easy question.

The idea is that the "half-life" is a certain amount of time.  It's the time it takes for 'half' of the atoms in any sample of that particular unstable element to 'decay' ... their nuclei die, fall apart, and turn into nuclei of other elements.

Look over the table.  There are 4,500 atoms of this radioactive substance when the time is 12,000 seconds, and there are 2,250 atoms of it left when the time is ' y ' seconds.  Gosh ... 2,250 is exactly half of 4,500 !  So the length of time from 12,000 seconds until ' y ' is the half life of this substance !  But how can we find the length of the half-life ? ? ?

Maybe we can figure it out from other information in the table !

Here's what I found:

Do you see the time when there were 3,600 atoms of it ? 
That's 20,000 seconds.

... After one half-life, there were 1,800 atoms left.
... After another half-life, there were 900 atoms left.
... After another half-life, there were 450 atoms left. 

==>  450 is in the table !  That's at 95,000 seconds.

So the length of time from 20,000 seconds until 95,000 seconds
is three half-lifes.

The length of time is (95,000 - 20,000) = 75,000 sec

                                     3 half lifes = 75,000 sec

Divide each side by 3 :   1 half life = 25,000 seconds

There it is !  THAT's the number we need.  We can answer the question now.

==> 2,250 atoms is half of 4,500 atoms.

==> ' y ' is one half-life later than 12,000 seconds

==> ' y ' = 12,000 + 25,000

         y   = 37,000 seconds  .

Check: 
Look how nicely 37,000sec fits in between 20,000 and 60,000 in the table.

As I said earlier, this is not the simplest half-life problem I've seen.
You really have to know what you're doing on this one.  You can't
bluff through it.


7 0
3 years ago
The pH of a 0.25 M aqueous solution of hydrofluoric acid, HF, at 25.0 °C is 2.03. What is the value of Ka for HF?
Mazyrski [523]
Last option that is none of above is right answer.
8 0
3 years ago
Read 2 more answers
Dustin is mixing concrete. A formula for concrete calls for 3/8 gal of water. Dustin wants to make 7/9 more concrete than the fo
slava [35]
We can use a ratio to solve this question. Lets refer to the amount formed by the formula as a serving
1 serving needs 3/8 gal
We want to create 7/9 servings extra, so
1 + 7/9 = 16/7
1 : 3/8
16/7 : x
1/(3/8) = (16/7) / x
8 / 3 = 16x / 7
x = 7/6
He needs to use 7/6 gallons of water.
5 0
3 years ago
Other questions:
  • How many moles of sodium metal are needed to make 3.6 moles of sodium chloride?
    12·1 answer
  • How many atoms are in Cu2MgHO
    12·1 answer
  • The enthalpy change, ΔH, for a reaction at constant pressure is defined as: ΔH = ΔE + PΔV. For which of the following reactions
    12·1 answer
  • What is the name of the covalent compound CCl4?
    11·1 answer
  • A gas inside a piston initially has a pressure of 1.2 bars at temperature of 25 degree C and volume of 20.0 mL. If temperature i
    10·1 answer
  • State 3 characteristics of a temporary physical change<br>​
    10·1 answer
  • Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes. draw
    6·1 answer
  • Please help me with this question, if you can! :)
    5·1 answer
  • A group of students used the instructions below to make a model of a watershed. When water washes over the water-soluble ink, th
    5·1 answer
  • Someone pleaseeeeee helppp
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!