Who was the first to propose the existence of atoms? John Dalton Democritus Joseph Proust Ernest Rutherford

Answers

Answer 1
Answer:

Answer is: Democritus.

Democritus (c.460 — c.370 BC) was an Ancient Greek philosopher.

According to his atomic theory:

1) everything is composed of atoms.

2) atoms are physically indivisible

3) there is empty space between atoms.

4) atoms are indestructible and in motion.

5) there is an infinite number of atoms, which differ in shape and size.

Answer 2
Answer:

Democritus was the first to propose the existence of atoms. Option A is the correct answer.

Thus, In contrast to the outdated idea that matter might be divided into any arbitrarily small quantity, atomic theory argues that matter is formed of discrete units called atoms.

It was first introduced as a philosophical idea by Democritus in ancient Greece and India, and it later became a widely accepted scientific theory. Chemical advancements at the time demonstrated that matter did indeed behave as if it were composed of particles.

A fundamental physical quality of matter is mass. The term "atomic mass" refers to the weight of an atom or molecule. To determine the average mass of elements and molecules as well as to resolve stoichiometry issues, the atomic mass is used.

Thus, Democritus was the first to propose the existence of atoms.

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Is sodium element a metal nonmetal or metalloid

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Sodium Na is a soft, low-density member of the alkali metal family. The element sodium is a very delicate silvery-white.

Sodium makes up 2.8 percent of the Earth's crust and is the most prevalent alkali metal and sixth most plentiful element on the planet.

A metal is a substance that has a shiny look when freshly processed, polished, or shattered, and conducts electricity and heat rather effectively. Typically, metals are malleable and ductile.

Ionic linkages mix metals with non-metals, whereas metallic connections happen between metal atoms. The metallic bonding joins metal atoms.

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Sodium Na is a metal that belong to the alkali metal with low density and soft 

What is the mass percent of oxygen in sodium bicarbonate (NaHCO3)?19.04%



27.37%



38.09%



57.13%

Answers

Na- 11=22

H-1 =1

C-12=12

O3=16*3 =48


total = 22+1+12+48 = 83

83-----> 48

100-----> 100*48/83=57.83 = 57.13 is nearest answer

2. Based on what you know about waves and light, do you think that light can bemodeled as a wave? Explain why or why not.

Answers

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

Hope this helps

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

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Corrosion is the process by which iron is oxidized by elemental oxygen. therefore oxygen is the (oxidizing / reducing) agent and (gives / accepts) electrons.

Answers

Answer:

Oxygen is the oxidizing agent and accept electrons

Explanation:

  • Corrosion is an example of a redox reaction which involves both reduction and oxidation process.
  • During corrosion a metal loses electrons and becomes oxidized to form a metal ion.  Therefore, oxygen is the oxidizing agent since it undergoes reduction by gaining electrons.
  • Therefore, during corrosion of iron, iron is the reducing agent and gives electrons, while oxygen is the oxidizing agent and accepts the electrons.

The Hadley , Ferrel , And polar cells are all patterns of

Answers

The Hadley, Ferrel, and Polar cells are all large scale atmospheric circulatory systems. 

PLEASE HELPPPPP Antimony exists naturally as 2 isotopes. Antimony-121 has a mass of 120.9038 amu and an abundance of 57.30%. Determine the mass of the other isotope, antimony-123 knowing the average atomic mass of the element is 121.80 amu.

Answers

Answer: 1.6.905.x2.00=amu

Explanation:

if you multiply the atomic mass x 2.00 it will give you 1.6.905x2.00Amu your welcome