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tankabanditka [31]
3 years ago
14

ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST

Chemistry
1 answer:
skad [1K]3 years ago
4 0

Answer:

J.J. Thomson

Explanation:

According to my book and wiki, Historically, the mass of the electron was determined directly from combining two measurements. The mass-to-charge ratio of the electron was first estimated by Arthur Schuster in 1890 by measuring the deflection of "cathode rays" due to a known magnetic field in a cathode ray tube. It was seven years later that J. J.

Please correct me if I'm wrong.

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Which elements in the periodic table are metalloids or have semimetallic properties
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Hi There! :)

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8 0
4 years ago
13. What is the charge of an aluminum ion that has 13 protons and 10 electrons?
Ksenya-84 [330]

Answer:

+ 3

Ex planation:

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7 0
3 years ago
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A rock is believed to have been formed 1.25 billion years ago, as calculated by using potassium-40 dating. If the half-life of p
Leya [2.2K]

Answer:

The answer to the question is

50 % of the original amount of potassium 40 will be left after one half life or 1.25 billion years

Explanation:

To solve the question we note that the half life is the time for half of the quantity of  substance that undergoes radioactive decay to  disintegrate, thus

we have

half life of potassium 40 K₄₀ = 1.25 billion years

To support the believe tht the rock was formed 1.25 billion years ago we have

N_{(t)} =N_{(0)} (\frac{1}{2}) ^{\frac{t}{t_{\frac{1}{2} } } }

After 1.25 billion years we have

N_{(t)} =N_{(0)} (\frac{1}{2}) ^{\frac{1.25billion}{1.25 billion}  } } }  = N_{(t)} =N_{(0)} (\frac{1}{2}) ^{1 } } } =0.5 of N_{(0)} will be left or 50 % of the original amount of potassium 40 will be left

4 0
4 years ago
What is the mole ratio of SnF2 to HF
S_A_V [24]

Answer:

Answer:

12. 5

11.

10

10

15. 7

14. 11

2

=

16

16

18. 3

+

11

17

3

4

co

loo

8

Step-by-step explanation:

12. 5

11.

10

10

15. 7

14. 11

4 0
3 years ago
Does anyone know the answer???​
Dmitrij [34]
And Answer what answer would be 3.14
7 0
3 years ago
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