Three basic characteristics that all living things on earth have in common

Which element is most likely to replace hydrogen in a displacement reaction?

LUCKY_DIMON [66]

Answer: The correct option is (D) lithium (Li).

Explanation: Hydrogen is the element which belong to period 1. The atomic number of hydrogen is, 1

The electronic configuration of hydrogen is,

The number of valence electrons present in hydrogen is, 1.

(A) Helium is the element which belong to period 1. The atomic number of helium is, 2

The electronic configuration of helium is,

The number of valence electrons present in helium is, 2.

(B) Oxygen is the element which belong to period 2. The atomic number of oxygen is, 8

The electronic configuration of oxygen is,

The number of valence electrons present in oxygen is, 6.

(C) Nitrogen is the element which belong to period 2. The atomic number of nitrogen is, 7

The electronic configuration of nitrogen is,

The number of valence electrons present in nitrogen is, 5.

(D) Lithium is the element which belong to period 2. The atomic number of lithium is, 3

The electronic configuration of lithium is,

The number of valence electrons present in lithium is, 1.

From this we conclude that the lithium element has the same number of valence electrons as hydrogen.

Hence, the correct option is (D) lithium (Li).

3 0

3 years ago

The sensory division of the body

lesya [120]

The answer is A i believe

3 0

3 years ago

Vibrio cholera is a bacterium that causes the diarrheal disease known as cholera. In the 1800s

ArbitrLikvidat [17]

Answer:

''If the old cells inoculated in chicken, it produces resistance in the chicken against new V. cholera cells.''

Explanation:

From the data provided by Louis Pasteur, we make a hypothesis i. e. ''If the old cells inoculated in chicken, it produces resistance in the chicken against new V. cholera cells.'' From these observation we can assume that by allowing old V. cholera cells to chicken, it did not cause any disease but make immunity against the new V. cholera cells which are more effective from old V. cholera cells.

4 0

3 years ago

The 1st Law of Thermodynamics states that energy is neither created nor destroyed only transfer to forms. Why is a food chain an

belka [17]

Answer:

Food chain is an excellent example of the first law of thermodynamics.

Explanation:

First law of thermodynamics states that energy of the universe is constant. It is always found in the universe in some form or the other. It cannot be destroyed or totally used up and we cannot also create energy out of anything in this world. Energy transforms from one form to another form.

Food chain is considered to be an excellent example of 1st law of thermodynamics. Every living organisms in the world posses energy. And all living organisms consumed each other or eat each other for their survival and consumes these energy to survive. So the energy possessed in one organisms or animal is transferred to the other organism that is higher in the food chain when they eats the lower organisms or animal in the food chain.

Thus energy transfers form one form to another.

3 0

3 years ago

A plant breeder is trying to develop more purple colored violets. She knows the purple violets she has can be PP or Pp for the p

GenaCL600 [577]

Answer:

c) Both of the parents' genotype must have been Pp.

Explanation:

A plant breeder is trying to develop more purple colored violets. She knows the purple violets she has can be PP or Pp for the purple color. She crosses two purple violets. Of the four plants that result, one is white and three are purple. Obviously, the parents' genotype must have been Pp.

5 0

3 years ago