How does the modern periodic table arrange elements?A.
by atomic mass

B.
by atomic number

C.
by number of isotopes

D.
by electron mass

Answers

Answer 1
Answer:

Answer:

B. By atomic number.

Explanation:

The atom is the most basic unit of matter with properties of a chemical element. The atom is the fundamental component of all matter. All atoms are made up of a central nucleus in which there are positively charged particles, the protons, around which other negatively charged particles, the electrons, move. The nucleus of the atom also has neutrons, which have a neutral charge.

The atomic number, which is represented by the letter Z, indicates the number of protons that are present in the nucleus of an atom. Determine the identity of an atom and its properties.

The atomic number is used to classify the elements within the periodic table of the elements.

Answer 2
Answer: By increasing atomic number

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How many types of nomenclature in the features of organic chemistry? What are they?

Answers

Answer:

there are two types of nomenclature used in organic system. the most widely used and universally accepted system of nomenclature is the IUPAC system of nomenclature. some compounds are referred to by their common name that existed before the IUPAC system or is more widely known than the IUPAC names.

Explanation:

IUPAC ( international union of pure and applied chemistry) system of nomenclature is used to name compounds in organic system. there are some principles to be followed while using this nomenclature. some of them are:-

1) identification of parent chain is the first step. the longest hydrocarbon chain is the parent chain.

2) identification of all the substituent groups of the parent chain is also required.

3) hydrocarbon cyclic ring has a fixed prefix and  that is cyclo.

How do scientist communicate the results of an investigation?​

Answers

Answer:

scientists often communicate their research results in three general ways:

1) One is to publish their results in peer-reviewed journals that can be ready by other scientists.

2) Two is to present their results at national and international conferences where other scientists can listen to presentations

Explanation:

Answer:money

Explanation:

Which element is likely to have the highest thermal conductivity

Answers

Gallium, due to its metal properties, which tend to conduct electricity and heat quite well. 

Your answer is: Galium

Which of the following describes electron sharing between two oxygen atoms.A)Each Oxygen shares 6 electrons with the other
B)Each Oxygen shares 2 electrons with the other
C)Each Oxygen shares 8 electrons with the other
D)Each Oxygen shares 1 electrons with the other

Answers

Option B because the electron sharing between two oxygen atoms would be that each oxygen shares two electrons with the other.

the relative molecular mass of sodium hydroxide is 40. if 60 grams of sodium hydroxide are dissolved in water how many moles will there be in the solution?

Answers

The formula to find the amount of moles of a substance used is: actual mass divided by relative molecular mass. 

Therefore,
60/40 = 1.5 moles

what ere the different types of petrol used in petrol pumps?what is the composition of each and what type of vehicle is each suitable for?is there a difference in the price?

Answers

Petrol is primarily characterised by its octane number which defines its ability to burn efficiently and produce more energy per unit. A low octane petrol particle blast inside the engine instead of burning from spark this is called knocking as it produces knocking sound in the engine, to counter this an anti-knocking agent is added to petrol. Earlier Lead was used as an anti-knocking agent but it is highly toxic ,also the researchers who experimented lead with petrol died unnatural death. In later stages when effects of lead toxicity started showing up lead was replaced by benzene compounds as anti-knocking agents this is know as Unleaded petrol. Benzene is carcinogenic and started showing its ill effects after few years especially in densely populated cities. Govts have reduced the concentration of benzene in petrol thereafter and emphasised on implementation of Euro iv standards.