All categories

3 years ago

Does Moseley's assertions about the arrangement of elements _________ Mendeleev's earlier work on the periodic table?

1 answer:

7 0

I believe it’s discarded because Moseley rearranged the elements by the number of protons is instead of atomic weight like Mendeleev did

You might be interested in

How many atoms are bonded to the central atom in a fluorine (F2) molecule?

mylen [45]

Answer:

Only one atom are bonded to the central atom in the $F_{2}$ .

Explanation:

Fluorine most electronegative element.

The atomic number of fluorine is 9.

Electronic configuration - $1s^{2}2s^{2}2p^{4}$

Hence, it required only one electron to get noble gas[Ne] electronic configuration.

In the $F_{2}$ molecule two fluorine atoms are bonded by single covalent bond to get stability.

Each atom share one electron and form a bond.

The structure of $F_{2}$ molecule is as follows.

3 0

3 years ago

11) A sample of rhenium of suspected extrasolar origin (translation: not from this solar

jarptica [38.1K]

Answer:

Atomic number 75 is dedicated to an element named rhenium and has been given Re as its chemical name.

Explanation:

With a really low concentration it is one of the rarest metals that is found in Earth's crust.

Like all other elements rhenium also has certain isotopes among with 185 and 187 are the most stable ones. Hence these two are the ones that are naturally available abundance is 34% and 63% respectively.

4 0

3 years ago

An aqueous solution of potassium hydroxide is standardized by titration with a 0.122 M solution of hydrobromic acid. If 22.1 mL

Gemiola [76]

Answer:

The molarity of the potassium hydroxide solution is 0.104 M

Explanation:

Step 1: Data given

Molarity of hydrobromic acid (HBr) = 0.122 M

Volume of potassium hydroxide (KOH) = 22.1 mL = 0.0221 L

Volume of hydrobromic acid = 18.8 mL = 0.0188 L

Step 2: The balanced equation

HBr(aq) + KOH(aq) → KBr(aq) + H2O(l)

Step 3: Calculate moles of HBr

Moles HBr = molarity HBr * volume HBr

Moles HBr = 0.122 M * 0.0188 L

Moles HBr = 0.0022936 moles

Step 4: Calculate molarity of KOH

We need 0.0022936 moles of KOH to neutralize the HBr

Molarity = moles / volume

Molarity KOH = 0.0022936 moles /0.0221 L

Molarity KOH = 0.104 M

The molarity of the potassium hydroxide solution is 0.104 M

4 0

3 years ago

Does ice float on water

Alex17521 [72]

Yes as it is less dense than the liquid water

5 0

3 years ago

Read 2 more answers

Describe the differences in the tlc of the reaction mixture before heating and after heating and explain the observed change in

AVprozaik [17]

Using a thin stationary phase supported by an inert backing, thin layer chromatography (TLC) is a chromatographic technique used to separate the components of a mixture.

It can be carried out on an analytical scale to track the development of a reaction or on a preparative scale to purify minute quantities of a chemical. Because of its simplicity, comparatively low cost, great sensitivity, and rapid separation, TLC is an extensively used analytical method. Similar to all chromatography, TLC works on the premise that a chemical will have varying affinities for the mobile and stationary phases, which will influence how quickly it migrates. TLC aims to produce well-defined, well-separated spots.

Learn more about thin layer chromatography here-

brainly.com/question/10296715

#SPJ4

3 0

2 years ago