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Kitty [74]
2 years ago
9

If there is a fire in the laboratory, notify the teacher at once; then prepare to --

Chemistry
1 answer:
geniusboy [140]2 years ago
3 0
Hbshdhsbshs shsbshshs sjsbshsb she’s s
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Witch two chemists organized the elements based on properties suck as how the elements reacts or whether they are solid or liqui
Korvikt [17]

Answer:

Antoine Lavoisier and Johann Wolfang Döbereiner organized the elements based on properties such as how the elements reacts or whether they are solid or liquid.

Explanation:

The periodic table of the elements as we have it today was developed as a result of the work of several notable centuries who lived centuries apart, all of who made notable contributions to development of the modern periodic table in use today.

In 1789, Antoine Lavoisier, a French Chemist provided a definition of elemets which he defined as a substance whose smallest units cannot be broken down into a simpler substance. He further grouped the elements into two as metals and nonmetals.

In 1829, German physicist Johann Wolfang Döbereiner arranged elements in groups of three in increasing order of atomic weight and called them triads. His arrangement owasf elements into triads was based on his observation of similarities in physical and chemical properties of certain elements.

John Newlands, a British Chemist was the first to arrange the elements into a periodic table with increasing order of atomic masses.

In 1869, Russian chemist Dmitri Mendeleev developed a periodic table which provided a framework the modern periodic table. He arranged the elements according to their atomic weight, leaving gaps for elements that were yet to be discovered.

The modern periodic table arranges elements based on increasing atomic number.

5 0
3 years ago
An object should float in a liquid if it is
Reptile [31]
Less dense than the liquid
6 0
2 years ago
Magnesium combines with oxygen to form magnesium oxide. If 10.57 g of
Phantasy [73]

The total mass is 10.57+6.96=17.53 g.

So, the percent by mass of magnesium is (10.57)/(17.53) * 100 = <u>60.3%</u>

<u />

The percent by mass of oxygen is (6.96)/(17.53) * 100 = <u>39.7%</u>

7 0
2 years ago
How many moles does 205g of helium, He contains ?
Ne4ueva [31]
<span>Moles = weight in g / atomic weight So, moles in 40 g of He = 40 / 4 = 10 moles.</span>
7 0
2 years ago
Read 2 more answers
Help please!!!!
emmasim [6.3K]
Mag aral ka muna bago ml
4 0
2 years ago
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