Need to lose one electron to form a stable octetb. alkali metals
c. alkaline earth metals
d. noble gases
e. lanthanides

Answers

Answer 1
Answer: Alkali metals need to lose 1 electron to form a stable octet.
Answer 2
Answer: alkali metals should loose one to make a stable octet

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If the half-life of an unstable isotope is 10,000 years, and only 1/8 of the radioactive parent remains in a sample, how old is the sample?

Answers

Have in mind that a radioactive half-life is the amount of time it takes for half of a sample to decay. So, if the amount remaining after x half-lives is (1/2)↑x times the amount you started with. So for 1/18 of radioactive parent then (1/2)↑6 equals 30,000 years

Answer: 30,000

Explanation: I'm taking gradpoint

Ionic bonds generally form when the bonded elements have a difference in electronegativity greater than 1.5 to 1.7. Subtract the electronegativities for the following pairs of elements and predict whether they form ionic bonds.Electronegativity difference of Na and F:


yes


no

Answers

Ionic bonds are formed by the differences in the electronegativities of the elements. Yes, sodium, and fluorine will form ionic bonds. Thus, option A is correct.

What are ionic bonds?

Ionic bonds are the category of chemical bonds that are formed by the complete transfer of the electron from one atom to another resulting in the formation of the cation and the anion. This sharing occurs through the difference in electronegativity.

If the electronegativity difference is more than 1.5 to 1.7 then, the electron sharing occurs by the virtue of the valence shell.

Given,

Electronegativity of fluorine (F) = 3.98

Electronegativity of sodium (Na) = 0.93

The differences are calculated as:

= Electronegativity of fluorine - Electronegativity of sodium

= 3.98 - 0.93

= 3.05

As 3.05 > 1.7 it will form the ionic bond.

Therefore, yes sodium and fluorine form an ionic bond.

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guys help please. A rigid container holds a gas at a pressure of 55 kPa and a temperature of -100.0°C. What will the pressure be when the temperature is increased to 200.0°C?

Answers

Answer:

It’s 150 C :)

Explanation:

Water is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?

Answers

The correct option for above statement is

a.from a gas to a liquid


Explanation:

A liquid will be regenerate to a gas by heating. A gas will be regenerate into a liquid by increasing the pressure of a gas sample. A liquid will be regenerate to a gas by cooling. A gas will be regenerate into a liquid by cooling.

Explanation:

In vapor state of water, molecules are far apart from each other as they have high kinetic energy. Hence, they move rapidly from one place to another. Therefore, the molecules are far apart from each other.

Whereas when the speed of molecules slow down then gaseous (or vapor) state of water changes into liquid state. As decrease in kinetic energy of molecules will bring them closer to each other.

Hence, we can conclude that change of state that has most likely taken place is liquid state.

The table below gives information about the nucleus of each 4 atoms Atom Number of protons Number of neutrons

A 6 6

D 6 7

G 7 7

E 7 8

How many different elements are represented by the nuclei in the table?

A 1

B 2

C 3

D 4

Answers

Atom Number of protons Number of neutrons. 2 elements are represented by the nuclei in the table

What is the difference between atomic number and atomic mass ?

Atomic number of an element  is defined as total number of protons present in the nucleus, neutrons carry no net electrical charge, so it is the charge number of the nucleus.

atomic mass of an element can be defined as the atomic weight is measured total mass of an element’s atom, the total number of neutrons and protons in the nucleus of an atom.

Both Atomic mass and an atomic number of elements are closely related if  atomic number is high, then the atomic mass is also said to be high.

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Answer:

B.

Explanation:

BECAUSE IT IS B.

What is the purpose of the written conclusion in an experiment?

Answers

Answer:

Explanation:

The conclusion is the summary of the post experimental analysis. This involves the comparison of the results of the experiment with the theory and associated background literature related to the research or experimentation topic.

The purpose of the conclusion is to make a brief account of the findings of the research or experimentation process.

it answers the original question that led to the hypothesis