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3 years ago

An elements atomic number is 30. How many protons would an atom of this element have?

Physics

2 answers:

iris [78.8K]3 years ago

6 0

The atomic number is the number of protons. If the atomic number is 30, then the atom will have 30 protons.

Romashka-Z-Leto [24]3 years ago

5 0

Hi ;)
First of all, The number of protons is always equal to the number of electrons in a neutral atom.Since we have 30 protons and 30 electrons ,the positive charge on the proton is cancelled by the negative charge on the electron leaving a neutral atom.

Positive 30 and negative 30 equals 0.

Therefore , that atom would have 30 protons .

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uranmaximum [27]

Answer:

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Explanation:

Given data:

height of raised sewage = 5.49 m

rate of sewage =1.89*10^6 lt/day

density of sewage = 1.050 kg/m^3

power is written as

$P = \frac{work}{time}$

work = m g h

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h -height

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= 1984500 kg

time = 24 hours* 3600 seconds per hour

power $P = \frac{( 1984500)(9.8)( 5.49)}{(24)(3600)}$

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3 years ago

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added

amid [387]

Answer:

187 J

Explanation:

First Law of Thermodynamics :

ΔQ = ΔW + ΔU

ΔQ : Heat. If it added to system then positive and if it is rejected by system then negative.

ΔW : Work. If it done by the system then positive and if it is done on system then negative.

ΔU : Internal Energy. If it positive then temperature of system increased and if it is negative then temperature of system decreased.

ΔQ = 79 J

ΔW = - 108 J

ΔU = ?

substituting the value in the equation:

79 = -108 + ΔU

∴ ΔU = 187 J

7 0

3 years ago

An engine has an imput of 100 j and gives out 27 j of useful kenetic energy what is the efficiency of the engine

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Answer:

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2 years ago

The atomic radius of metal X is 1.20 × 102 picometers (pm) and a crystal of metal X has a unit cell that is face-centered cubic.

dmitriy555 [2]

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3 years ago

A 100kg car starts from rest at the top of a hill with a height of 50m. which of the following is this cars kinetic energy at th

Anarel [89]

Explanation:

KE =1/2 MV^2

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3 years ago