3 years ago

Which element has the highest ionization energy A. Calcium B. Bromine C. Astatine

2 answers:

6 0

3. Of the 3 elements fluorine, bromine, and calcium, which has the highest and which the lowest ionization energy? a) Bromine has the highest and calcium has the lowest.

inessss [21]3 years ago

4 0

Answer:

bromine

Explanation:

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Thallium consists of 29.5%TI-203 and 70.5%TI-205. What is the relative atomic mass of thallium?

VladimirAG [237]

Atomic mass :

29.5 * 203 + 70.5 * 205 / 100 =

5988.5 + 14452.5 / 100 =

20441 / 100 = 204.41 u

atomic mass of Thallium 204.41 u

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3 years ago

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Calculate the work, w, gained or lost by the system when a gas expands from 15 L to 45 L against a constant external pressure of

marta [7]

Answer:

Work done by the system = 4545 J

Explanation:

The expression for the calculation of work done is shown below as:

$w=-P\times \Delta V$

Where, P is the pressure

$\Delta V$ is the change in volume

From the question,

$\Delta V$ = 45 - 15 L = 30 L

P = 1.5 atm

$w=-1.5\times 30\ atmL$

Also, 1 atmL = 101 J

So,

$w=-1.0\times0.75\times 101\ J=-4545\ J$ (negative sign implies work is done by the system)

Work done by the system = 4545 J

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3 years ago

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elena55 [62]

80. Ionic
81. Covalent
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3 years ago

What element has 81 protons in the nuclei of its atoms?

WITCHER [35]

Thallium has got 81 protons

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Which statement is most likely correct about the average temperatures in San Francisco, California as compared to Norfolk, Virgi

Lynna [10]

Answer:

It is higher in Norfolk because of the warm ocean currents from the south

Explanation:

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3 years ago