What is an atom, and how is it composed?

2 answers:

7 0

Atoms can join together to form molecules, which in turn form most of the objects around you. Atoms are composed of particles called protons, electrons and neutrons. Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all.

Rudiy273 years ago

3 0

The atom is the smallest unit of an element that maintains the properties of that element. All atoms are composed of subatomic particles called neutrons (particles with no charge, neutral), electrons (negatively charged particles) and protons (positively charged particles).

The proton is located in the nucleus, an atom's central region. The number of protons in the nucleus is the atomic number, which determines the identity of an element. The neutron is located in the nucleus of an atom. Together, the total number of protons and neutrons in the nucleus determine the mass number of the atom.

The electron is likely to be found in the electron cloud, a region around the nucleus of an atom. The electrons located in the electron cloud interact with other atoms or ions when joining together to create a compound. A compound a substance made up of atoms or ions of two or more different elements joined by chemical bonds.

Hope that helps.

Happy learning! - Ann

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Water and minerals move up the xylem because of a vacuum created by _____.

Galina-37 [17]

Answer:

The right answer is B) evaporation

Explanation:

Transpiration occurs at the leaf surface which is the loss of water due to the evaporation. This phenomenon works as trigger of water and mineral movement above to the xylem. Due to the evaporation of water at the leaf, negative pressure is created at the surface of leaf. Tension is produced which results in the pull of water from roots up to the xylem vessels.

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3 years ago

How many significant figures are in 136,000 ml?

WINSTONCH [101]

Answer:

There are 3 sig figs

Explanation:

Sig figs are the amount of figures counting from the left side of the number until you reach the first zero. Starting from the left, I counted one, three, and six. That's 3 numbers, and therefore, that's how we got our answer. The only exception is when there is a decimal. Then all the numbers before the decimal, despite whether or not they're zeros, are sig figs.

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3 years ago

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How to balance the chemical equation: <br> CO2+H2O-->C6H12O6

Andru [333]

Answer:

6H₂O + 6CO₂ + energy → C₆H₁₂O₆ + 6O₂

Explanation:

The given reaction represent the formation of glucose so it is photosynthesis reaction.

Photosynthesis:

It is the process in which in the presence of sun light and chlorophyll by using carbon dioxide and water plants produce the oxygen and glucose.

Carbon dioxide + water + energy → glucose + oxygen

water is supplied through the roots, carbon dioxide collected through stomata and sun light is capture by chloroplast.

Chemical equation:

6H₂O + 6CO₂ + energy → C₆H₁₂O₆ + 6O₂

it is known from balanced chemical equation that 6 moles of carbon dioxide react with the six moles of water and created one mole of glucose and six mole of oxygen.

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3 years ago

The amount of radioactive carbon-14 in a sample is measured using a Geiger counter, which records each disintegration of an atom

sergij07 [2.7K]

Answer:

4121 years

Explanation:

From;

0.693/t1/2 = 2.303/t log No/N

t1/2= half life of the carbon-14

No= count rate of the living tissue

N= count rate of the sample