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
Hunter-Best [27]
3 years ago
5

What do the atoms of elements in the same group have in common? A. They have the same atomic numbers. B. They have the same aver

age atomic masses. C. They have the same number of electron shells. D. They have the same number of electrons in their outermost shells.
Physics
1 answer:
sergiy2304 [10]3 years ago
8 0

Answer:

A. They have the same atomic numbers.

Explanation:

Elements are defined based on the atomic number, which is the number of protons in the nucleus: this means that atoms of the same element have always the same number of protons in their nuclei (and so, always the same atomic number).

The other choices are wrong because:

B. They have the same average atomic masses. --> this is false for isotopes, which are atoms of the same element having a different number of neutrons. Since the atomic mass is calculated from the sum of the masses of protons and neutrons in the nucleus, two isotopes of the same element have different atomic mass

C. They have the same number of electron shells. --> this can be false when an atom of an element loses/gains an electron, becoming an ion: in that case, the number of electron shells can change,  since the number of electrons has changed.

D. They have the same number of electrons in their outermost shells. --> this is also false in case one of the atoms is an ion, since the number of electrons is different.

You might be interested in
Multiple-Object Accelerating Systems: As shown in the figure, two blocks are connected by a very light string, and the upper blo
djverab [1.8K]

Part A.

To get the acceleration of the system we consider the two blocks as a single mass. For this situation we have, from Newton's second law, that:

T-W=(m_1+m_2)a

where T is the tension in the upper sting and W is the weight of the system. Solving the equation for a we have:

\begin{gathered} 6.6-(0.3+0.24)(9.8)=(0.3+0.24)a \\ a=\frac{6.6-(0.3+0.24)(9.8)}{(0.3+0.24)} \\ a=2.42 \end{gathered}

Therefore the acceleration of the system is 2.42 meters per second per second.

Part B.

Now, that we have the acceleration of the system we analyze the lower block individually; for this block the equation of motion is:

T^{\prime}-W^{\prime}=m_2a

where T' is the tension in the lower rope, W' is the weight of the lower block and m2 is its mass. Solving for the tension we have that:

\begin{gathered} T^{\prime}=(0.24)(9.8)+(0.24)(2.42) \\ T^{\prime}=2.93 \end{gathered}

Therefore the tension in the lower rope is 2.93 N

3 0
1 year ago
The scientific principle involve in the inflation of an airbag. Explain how this Device protects the drivers and the front passe
Tanzania [10]

Answer:

The deployment of an airbag protects the head and upper body of the driver and reduces some of the force exerted on the driver by the seatbelt. In the event that anyone in the vehicle is forced forward or to the side, they will come into contact with the airbag instead of the hard vehicle interior.

Explanation:

7 0
3 years ago
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and
lora16 [44]
The tension in the string and the acceleration must be equal for both masses. (See the free body diagrams)





8 0
2 years ago
A football is kicked from ground level with an initial velocity of 23.6 m/s at angle of 57.5° above the horizontal. How long, in
aniked [119]

Answer:

6 seconds is the best answer

3 0
2 years ago
What elements are in NaOH
agasfer [191]

Answer: Sodim hydroxide have a formula of NaOH . So the elements present in the compound is sodium,oxygen and hydrogen.

Explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • How was the water filtered to remove debris and living organisms?
    10·2 answers
  • How can you tell that an electroscope has an electrical charge? can you tell from an electroscope alone what kind of charge it h
    12·1 answer
  • What is the energy equivalent of an object with a mass of 25 kg?
    10·1 answer
  • What symbol do we use for the resultant?
    12·1 answer
  • Is a cookie crumbling or in other words breaking a cookie a physical change?
    13·2 answers
  • What is one advantage the Hyperloop would have over other types of transportation?
    14·2 answers
  • La resistencia total de un circuito en paralelo se calcula con la expresión: 1/ Rt = 1/ R1 + 1 / R2 + … + 1 / Rn
    11·1 answer
  • A monkey hangs motionless by one arm from a tree branch. Draw the free-body diagram.
    7·1 answer
  • A bird flies at a speed of 4 m/s. It flies for 2160 seconds from its nest to the field. How much distance did the bird cover?
    14·2 answers
  • Can anyone follow me​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!