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4 years ago

What must differ between the atom of two different elements?

Physics

1 answer:

kompoz [17]4 years ago

4 0

Answer:

1. protons in the atom

Explanation:

Elements in the periodic table are classified according to their number of protons: this means that each element has a different number of protons with respect to another element. There cannot be two elements having the same proton number.

The number of electrons in a neutral atom is equal to the number of protons, however an atom can loose or gain electrons (becoming an ion), therefore two elements can have the same number of electrons if one of them is an ion.

Moreover, an atom of an element can have different isotopes, which means atoms with same proton number but different number of neutrons: therefore, two elements can have the same number of neutrons in the nucleus.

Therefore, the only correct choice is

1. protons in the atom

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Little Tammy lines up to tackle Jackson to (unsuccessfully) prove the law of conservation of momentum. Tammy’s mass is 34.0 kg a

Leya [2.2K]

Answer:

So Tammy must move with speed 4.76 m/s in opposite direction of Jackson

Explanation:

As per law of conservation of momentum we know that there is no external force on it

So here we can say that initial momentum of the system must be equal to the final momentum of the system

now we have

$m_1v_1 + m_2v_2 = 0$

final they both comes to rest so here we can say that final momentum must be zero

now we have

$34 v + 54 (3 m/s) = 0$

$v = -4.76 m/s$

6 0

3 years ago

You grab a hot cookie sheet out of the oven this is an example of ______ energy transfer.

Maru [420]

I would say Conduction because you are touching the cookie sheet, even though it is hot (so heat) you are physically touching it so it would not be radiation

6 0

3 years ago

An object weighing 49 N is dropped from a height of 30 m. It is found to be moving with a velocity of 24m/s just before it hits

faltersainse [42]

The frictional force will be 0.22N.

<h3>What is Frictional force?</h3>

Frictional force is the force generated between two surfaces that are in contact and slide against each other.

Given,

Weight=4N

mass =4.9/9.8=0.5kg

Hieght =30m

velocity=24m/s

Acceration , v²-u²=2as

24²/2×30 =a , u is zero

a= 1.5m/s²

By Using conservation of energy ,

30F+1/2mv²=mgh

30F=1150-144

F= 6/30

F=0.2N

The force will be 0.2N

to learn more about Friction clickhttps://brainly.com/question/17608236

#SPJ9

6 0

2 years ago

A convection cell is BEST described as ___.

Helga [31]

D, a loop of moving air

6 0

3 years ago

Wha is the frequency of a wave having a period equal to 18 seconds?

Rainbow [258]

Answer:

5.5 × 10-2 hertz

Explanation:

The time taken by a wave crest to travel a distance equal to the length of wave is known as wave period.

= 0.055 per second (1 cycle per second = 1 Hertz)

Thus, we can conclude that the frequency of the wave is 5.5 X 10^{-2} hertz.

Hopes this helps, love <3

5 0

3 years ago