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2 years ago

An atom has 8 protons, 8 neutrons, and 8 electrons. another isotope of the same element might have

Chemistry

2 answers:

shutvik [7]2 years ago

7 0

Answer:It might have 10 neutrons

Reason: This is because an isotope of the same element must have the same number of electrons and protons so it can be assumed that the amount of neutrons can be changed.

Grace [21]2 years ago

3 0

Isotopes are atoms of the same element that have the same number of protons and electrons but different number of neutrons.
Masses of atoms are the sum of protons and neutrons. Therefore when the number of neutrons change but protons are the same, then the masses of the atoms change.
isotope 1 has 8 protons , 8 electrons and 8 neutrons.
isotope 2 has 8 protons, 8 electrons and 10 neutrons

mass of isotope 1 is 16
and mass of isotope 2 is 18

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A particular energy level in the hydrogen atom has E = -2.42 x 10-19 J. Use Bohr's model of the energy levels in hydrogen to cal

Zepler [3.9K]

Answer:

n=3

Explanation:

The expression for the energy of an electron for the hydrogen atom in the nth orbit is:-

$E_n=-2.18\times 10^{-18}\times \frac{1}{n^2}\ Joules$

Given that:-

$E_n=-2.42\times 10^{-19}\ Joules$

Applying in the equation to find the value of n as:-

$-2.42\times 10^{-19}=-2.18\times 10^{-18}\times \frac{1}{n^2}$

$n^2=\frac{2.18\times 10^{-18}}{2.42\times 10^{-19}}$

$n=\sqrt{\frac{21.8}{2.42}}=3$

7 0

2 years ago

When might a plot of ln[a] vs time not yield a straight line?

podryga [215]

Considering a reaction:
A → B
The rate equation may be described as:
r = -k[A]ⁿ
Taking the natural log,
ln(r) = -nln([A]) + ln(k)
Therefore, the only time the graph of ln[A] vs time will be a straight line is when the order of the reaction is 0, meaning the reaction is independent of reactant concentration.

6 0

3 years ago

Which development was a direct result of the

Keith_Richards [23]

<span>Many countries experienced the baby boom after the World War II ended. The baby boom resulted to the increase in suburbanization which is number 2. The more people/babies born, the more houses are needed. The countries who experienced the baby boom were not large enough to cater the population so mass developments happened.</span>

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3 years ago

Read 2 more answers

Which system in the body is able to fight off most infectious diseases, such as the common cold?

pashok25 [27]

<span>The immune system fights off infectious disease. This is the system which produces cells that fight off the common cold. This system is also very closely related to the lymphatic system. Some people have much stronger immune systems that others.</span>

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2 years ago

1/2 * m * v ^ 2 = mgh

viktelen [127]

C. the square root of 2gh

Explanation:

The square root of 2gh is equivalent to Torricelli's law in the equation.

given expression:

$\frac{1}{2}$ m v² = mgh

to find v, we make it the subject of the expression:

*multiply both sides of the equation by 2:

2 x( $\frac{1}{2}$ m v² )= 2 (mgh)

mv² = 2mgh

*cancel the mass, m appearing on both sides:

v² = 2gh

* find the square root of both side

v = √2gh

Learn more:

Expression brainly.com/question/11207748

#learnwithBrainly

4 0

2 years ago