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Tresset [83]
3 years ago
15

Helium is before lithium on the periodic table because the periodic table arranges elements by increasing ________.

Physics
2 answers:
Arte-miy333 [17]3 years ago
7 0
The Atomic Number...
I hope this helps
iren [92.7K]3 years ago
7 0

Answer:

atomic number

Explanation:

The chemical elements are organized according to several of their physical and, especially, chemical properties, the most important being the atomic number. However, these elements can be organized in different ways within the periodic table, without them losing their assigned place within it, all to achieve a better study of such elements. Thus, the elements can be divided into the table in several ways, depending on the property to be studied or of interest:

- Periods and groups.

- Representative elements, transition, internal transition and noble gases.

- Metal, non-metal and metalloid elements.

- Element families.

In any case, each chemical element has a fixed place in the periodic table in the form of a small square, or square, within which there are numbers, words and letters, which constitute the physical and chemical information of that element.

Atomic number of helium : 2

Atomic number of lithium : 3

Atoms of different elements have different numbers of protons. The atomic number - which is identified by the letter Z, by the German term zahl - indicates the number of protons that are present in the nucleus of an atom.

The atomic number defines the electronic configuration of the atom and allows the ordering of the different chemical elements in the periodic table, which begins with hydrogen (Z = 1) and continues with helium, lithium, beryllium, boron, carbon and nitrogen

It is important to keep in mind that an unaltered atom is electrically <u>neutral</u>: therefore, <u>its atomic number will always be the same as its number of electrons</u>. The atomic number also defines the level of filling of the successive electronic orbitals of the atom, a characteristic that really reflects the periodic table.

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c A ray of light is divided into its constituent colors by the first prism (left), and the resulting bundle of colred rays is reconstituted into white light by the second. Our modern understanding of light and color begins with Isaac Newton (1642-1726) and a series of experiments that he publishes in 1672.

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3 years ago
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An object is swung in a horizontal circle on a length of string that is 0.93 m long. Its acceleration is 26.36 m/s2. What is the
Igoryamba

Answer:

The object takes approximately 1.180 seconds to complete one horizontal circle.  

Explanation:

From statement we know that the object is experimenting an Uniform Circular Motion, in which acceleration (a), measured in meters per square second, is entirely centripetal and is expressed as:

a = \frac{4\pi^{2}\cdot R}{T^{2}} (1)

Where:

T - Period of rotation, measured in seconds.

R - Radius of rotation, measured in meters.

If we know that a = 26.36\,\frac{m}{s^{2}} and R = 0.93\,m, then the time taken by the object to complete one revolution is:

T^{2} = \frac{4\pi^{2}\cdot R}{a}

T = 2\pi\cdot \sqrt{\frac{R}{a} }

T = 2\pi\cdot \sqrt{\frac{0.93\,m}{26.36\,\frac{m}{s^{2}} } }

T \approx 1.180\,s

The object takes approximately 1.180 seconds to complete one horizontal circle.  

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3 years ago
Which statement(s) accurately describe the conditions immediately before and after the firecracker explodes:
lidiya [134]

Answer:

Option C, The total momentum of the fragments is equal to the original momentum of the firecracker.

Explanation:

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Answer:

Hehe

Explanation:

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