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4 years ago

Which elements has the smallest first ionization energy?

Physics

1 answer:

Setler [38]4 years ago

8 0

Answer:

Cesium has smallest ionization energy.

Explanation:

Ionization energy is the energy that an atom at ground state must be absorb to release an electron to form a cation. for eg.

H ⇒ $H^{+} + e^{-}$

The unit of ionization energy is $\frac{KJ}{mol}$ .

The ionization energy is minimum for cesium & maximum for fluorine.

Ionization energy depends upon the radius of atom. cesium has smallest radius so it has low Ionization energy.

Therefore the cesium has smallest ionization energy.

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Biologists use ball-and-stick models to study complex molecules by representing atoms with balls and bonds with sticks. DNA is a

AleksAgata [21]

One of the major limitations of using the ball and stick model for DNA, is that within a single double stranded segment of DNA, one would have to use many many balls to represent atoms that are present in the sugar phosphate backbone, along with all of the main atoms that compose the nitrogenous bases of DNA, we also cannot construct or show the helical form of DNA, by using balls and sticks as well.

7 0

3 years ago

A 45.8-kg girl is standing on a 151-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat sur

erik [133]

Answer:

a. 1.12m/s

b. 0.34m/s

Explanation:

Let Vgi = the velocity of the girl relative to the ice

Let Vgp = the velocity of the girl relative to the plank

Let Vpi = the velocity of the plank relative to the ice

Vgi = Vgp + Vpi

From the question, Vgp = 1.46/s

So, Vgi = 1.46 + Vpi

Conservation of Momentum (Relative to the ice), we have

Initial Momentum = Final Momentum

Because the girl and the plank are at rest initially, the initial Momentum = 0

So, 0 = Mg * Vgi + Mp * Vpi

Where Mg = Mass of the girl = 45.8kg

Mo = Mass of the Plank = 151kg

Make Vpi the subject of the formula, we then have

-Mg*Vgi = Mp*Vpi ---------- Divide through by Mp

Vpi = -Mg * Vgi/Mp

Vpi =( -45.8 * Vgi)/151

Vpi = -45.8Vgi/151

Remember that, we have (Vgi = 1.46 + Vpi)

We then substitute the expression of Vpi in the above equation

That is;

Vgi = 1.46 + (-45.8Vgi/151) ------- Open the bracket

Vgi = 1.46 - 45.8Vgi/151 ----------- Multiply through by 151

151 * Vgi = 151 * 1.46 - 45.8Vgj

151Vgi = 220.46 - 45.8Vgi --------- Collect like terms

151Vgi + 45.8Vgi = 220.46

196.8Vgi = 220.46 --------------- Divide through by 196.8

Vgi = 220.46/196.6

Vgi = 1.1213631739572736

Vgi = 1.12 m/s (Approximated)

So, the velocity of the girl relative to the ice is 1.12m/s

b. Velocity of the plank, relative to the ice

We can solve this using (Vgi = 1.46 + Vpi)

All we need to do is substitute 1.12 for Vgi in the equation

So, we have

Vgi = 1.46 + Vpi becomes

1.12 = 1.46 + Vpi -------- Collect like terms

1.12 - 1.46 = Vpi

-0.34 = Vpi

So, the Velocity of the plank is 0.34m/s to the left

3 0

4 years ago

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HEY can anyone tell me the Atomic Mass of Helium and also what ever the number u get pls round it!!

frozen [14]

The atomic mass of helium is 4.002602 u

7 0

3 years ago

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An electron, tial well may be anywhere within the interval 2a. So the uncertainty in its position is Î”x= 2a. There must be a co

lapo4ka [179]

Answer:

$K = \frac{h'}{8 m \ \Delta x^2}$ K

Explanation:

The Heisenberg uncertainty principle is

Δx Δp ≥ h' / 2

h’ = $\frac{h}{2\pi }$

The kinetic energy of a particle is

K = ½ m v²

p = mv

v = $\frac{p}{m}$

substitute

K = $\frac{1}{2} \frac{p^2}{m}$

from the uncertainty principle,

Δp = $\frac{h'}{2 \ \Delta x}$

we substitute

K = $\frac{1}{2m} ( \frac{h'}{2 \ \Delta x})^2$

$K = \frac{h'}{8 m \ \Delta x^2}$

4 0

3 years ago

Even though I answered this question all I just want to make sure

EastWind [94]

yes this is correct good job

4 0

3 years ago

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