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
arsen [322]
3 years ago
10

An atom of 40 18 Ar has a nucleus that contains a total of

Chemistry
2 answers:
melisa1 [442]3 years ago
5 0
Atoms are composed of protons, electrons, and neutrons. so, answer D can be discarded because it is not what atoms are made of. 

40 and 18 represent the atomic mass and atomic number respectively. the atomic number presents the number of protons. so there are 18 protons. the number of neutrons can be determined by taking the atomic mass minus the atomic number. neutrons= 40-18= 22 neutrons.

so the answer is B

Answer A may be correct if we assume the atom is neutral. in a neutral atom, the number of protons is the same as the number of electrons. but the electrons are not in the nucleus but orbiting it. the question specified the nucleus.
Cloud [144]3 years ago
4 0
The correct answer is b, 18 protons
You might be interested in
What compound is this?
Nezavi [6.7K]

Answer:

Carbon Tetrachloride

Explanation:

1 Carbon atom, 4 chlorine atoms (hence "tetra" prefix)

7 0
2 years ago
If volume is increased, the number of<br> collisions per second
frutty [35]

Answer:

Decreases

Explanation:

The particles have more space to move and will be less likely to collide.

5 0
3 years ago
What is the mass of 4.32 mol GaI3? <br> 455 g <br> 1,230 g <br> 1,720 g <br> 1,950 g
denis23 [38]

Answer:

D. 1,950 g

Explanation:

I completed the test and it is the correct answer!

8 0
3 years ago
Which cell organelle is where proteins are made? A. nucleus B. ribosome C. vacuole D. mitochondrion
N76 [4]

Answer:

B. ribosome

Explanation:

In the ribosomes, the codons get paired with anti codons to create a polypeptide or protein.

5 0
3 years ago
Read 2 more answers
Significant Digits and Scientific Notation Part 1: Determine the number of significant digits in each number and write out the s
MA_775_DIABLO [31]

Answer:

1. 6 significant digits. 2. 2 significant digits. 3. 8 significant digits. 4. 4 significant digits. 5. 8 significant digits. 6. 7 significant digits. 7. 2 significant digits.

Explanation:

All nonzero digits are significant. All zeros before nonzeros are insignificant. All zeros after nonzeros are insignificant unless they are made for precision of some data. So 405000 may have 3 or 6 significant figures. But usually all zero figures after significant digits are significant.

8 0
3 years ago
Other questions:
  • What is the time required for contamination source
    14·1 answer
  • What is the original source of most energy used on Earth?
    15·2 answers
  • PLEASE HELP
    6·2 answers
  • When you compress a spring, which type of energy increase
    7·1 answer
  • Classify the outcomes based on whether they are caused by adding or removing a reactant from a chemical reaction. The rate of th
    13·1 answer
  • A sequence of thermonuclear fusion processes inside massive stars can continue to transform the nuclei of elements such as carbo
    10·1 answer
  • The Rock Cycle moves in a specific order. True or<br> False
    12·1 answer
  • What is the molarity of I-(aq) in a solution that contains 34 g of SrI2 (molar mass 341 g) in 1.0 L of the solution? Show Work!
    14·1 answer
  • Which statement most accurately describes a chemical equation?
    6·1 answer
  • How long is a bench? Select the best estimate.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!