2 years ago

Which best describes the effect of jj Thomson discovery

1 answer:

7 0

JJ Thomson discovered electrons using the cathode ray. Electrons are negatively charged particles that orbit around the nucleus of an atom. Finding out that there was a negative charge to balance out the positive charge. This later helped develop Hund's Rule and the Pauli Exclusion Principle.

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What happens to the number of valence electrons as you move from element 1 to element 18 on the periodic table?

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Answer:

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the group number is=valence electrons. element 1 is in group 1 element 18 is in group 8. 1<8

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33) How many significant figures does the number 40230 have? *

Lyrx [107]

Answer:

Explanation:

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3 years ago

an isotope of cesium (cesium-137) has a half-life of 30 years if 1.0g of cesium-137 disintegrates over a period of 90 years how

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If a 100. -g sample of a hydrated compound contains 37.07-g sodium, 48.39-g carbonate and 14.54-g water, find the empirical form

Mumz [18]

he required empirical formula based on the data provided is Na2CO3.H2O.

<h3>What is empirical formula?</h3>

The term empirical formula refers to the formula of a compound which shows the ratio of each specie present.

We have the following;

Mass of sodium = 37.07-g

Mass of carbonate = 48.39 g

Mass of water = 14.54-g

Number of moles of sodium = 37.07-g/23 g/mol = 2 moles

Number of moles of carbonate = 48.39 g/61 g/mol = 1 mole

Number of moles of water = 14.54/18 g/mol = 1 mole

The mole ratio is 2 : 1: 1

Hence, the required empirical formula is Na2CO3.H2O

Learn more about empirical formula : brainly.com/question/11588623

3 0

1 year ago

What happens when a cell that has an internal salt concentration of 0.15M NaCl is placed into a solution of 0.01M NaCl?

Julli [10]

Answer: the cell will absorb more water which can lead to haemolysis (rising and bursting of the cell)

Explanation:

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