How are atoms and elements alike and different?

1 answer:

8 0

An element is an atom or group of the same type of atom in a concentrated, pure form. A molecule is a group of atoms that aren't all necessarily the same type of element. For example, in a sample of elemental iron, every atom in the sample will be an iron atom whereas in table salt, NaCl, half of the atoms are sodium atoms and the rest are chlorine atoms. Atoms are composed of a nucleus which has neutrally charged neutrons and positively charged protons, surrounded by a cloud of negatively charged electrons. Number of electrons and neutrons may vary from atom to atom of the same element, but the number of protons in the atom determine what element it is.

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Calculate the volume of a box, in cubic centimeters, which is 423 cm long, 12 cm wide, and 25 cm high. Report your answer with c

liq [111]

Answer:

130,000 cubic centimeters

Explanation:

The volume of a box is its length multiplied by its width multiplied by its height (lwh). 423 times 12 times 25 is 126,900. When multiplying, the number of significant figures is the same as the number with the least number of significant figures. The correct number of significant figures in this example is 2, so 126,900 would need to round up to 130,000 in order to have 2 significant figures.

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3 years ago

4. What animal resources from other continents benefited South Americans?

Rus_ich [418]

South America's major mineral resources are gold, silver, copper, iron ore, tin, and petroleum. These resources found in South America have brought high income to its countries especially in times of war or of rapid economic growth by industrialized countries elsewhere.

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3 years ago

Why can't hydrogen be grouped in a family?

Sveta_85 [38]

Answer:

A Family Portrait

That element is NOT in the family. When we told you about families, we said that they were groups of elements that react in similar ways. Hydrogen is a very special element of the periodic table and doesn't belong to any family. While hydrogen sits in Group I, it is NOT an alkali metal.

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3 years ago

Read 2 more answers

If the quantity of reactants used in a chemical reaction increase, then the quantity of the products produced will also be incre

oksian1 [2.3K]

Answer:

the amount of reactants is always directly proportional to the product

Explanation:

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4 years ago

Which of the following best helps to account for the fact that the F- ion is smaller than the O2- ion?

katrin [286]

Answer: Option (B) is the correct answer.

Explanation:

Both oxygen and fluorine are period 2 elements and when we move across a period then there occurs a decrease in atomic size of the atoms. Hence, the atomic radius of a neutral fluorine atom is smaller than a neutral oxygen atom.

Moreover, atomic number of fluorine is 9 and it has higher nuclear charge due to which it will cause more attraction of electrons. As a result, size of a fluorine ion will be smaller.

On the other hand, size of oxygen atom is larger and has small nuclear charge due to which attraction of electrons by its nucleus will not be strong enough. Hence, the size of $O^{2-}$ will be larger.

Thus, we can conclude that the statement $F^{-}$ has a larger nuclear charge than $O^{2-}$ has, is correct for the fact that the $F^{-}$ ion is smaller than the $O^{2-}$ ion.

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4 years ago