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3 years ago

How did Mendeleev organize the elements to create a periodic table

2 answers:

4 0

Mendeleev arranged the elements known at that time according to atomic mass. The elements were arranged in rows called periods, in increasing order. Each row had eight elements. He also arranged them accordingly in columns, where the elements in each column, called groups, had similar properties.

He left some blanks on his table because he predicted that the big gaps between some atomic mass' of elements indicated that there were other elements yet to be discovered that would fill in that gap. He was able to predict the atomic weights of some of the elements in between.

irga5000 [103]3 years ago

4 0

The answer is according to increase mass and similar properties

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A lightning bolt transfers 6.0 coulombs of charge from a cloud to the ground. In 2.0*10^-3 second. What is the average current d

Savatey [412]

Answer:

sup cuh, i just want the point lol

Explanation: sorry not sorry reases

6 0

2 years ago

A force of 125 N is applied to a 50 kg. Mass. What is the acceleration of the mass?

grandymaker [24]

The acceleration would be 2.5 m/sec^2
A= acceleration
F= force
M= mass
A = f/m
125N/50kg=2.5 m/s^2

3 0

4 years ago

A radio transfers 270 j of energy electrically, 94.5 j is transferred by sound. Work out the efficiency of this radio. Give your

MakcuM [25]

Answer:

35%

Explanation:

Given data

Amount of energy transferred (Input) = 270J

Amount of energy converted to sound (Output)= 94.5J

Efficiency = output/input*100

Efficiency= 94.5/270*100

Efficiency=0.35*100

Efficiency=35%

Hence the efficiency is 35%

6 0

3 years ago

Can two people with brown eyes have a blue eyed baby

Elena L [17]

Answer:

Yes

Explanation:

Each person has two alleles (forms of a gene) for a characteristic. We can represent them using letters.

Dominant trait are written as capitals. If a dominant allele is present in someone's genotype, the dominant trait will show.

The recessive trait only shows if a person has two recessive alleles.

Brown eyes is a dominant trait, and blue eyes is a recessive trait.

B = dominant brown eyes

b = recessive blue eyes

If someone has <u>brown</u> eyes, their genotype can be:

If someone has blue eyes, their genotype is:

The baby's genotype must be bb because it has blue eyes. <u>The baby gets one allele from each parent</u>.

See the photo for Punnett square. If the parents are both Bb, then they could each give the b allele, resulting in a blue-eyed baby.

8 0

4 years ago

A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic frictio

Blababa [14]

Answer:

(B) 1.6 m/s^2

Explanation:

The equation of the forces acting on the box in the direction parallel to the slope is:

$mg sin \theta - \mu N = ma$ (1)

where

$mg sin \theta$ is the component of the weight parallel to the slope, with m = 6.0 kg being the mass of the box, g = 9.8 m/s^2 being the acceleration of gravity, $\theta=39^{\circ}$ being the angle of the incline