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Naddika [18.5K]

3 years ago

6

There are only about 118 known elements. How is it possible that all matter in the universe is made up of just over 100 elements

?

1 answer:

Deffense [45]3 years ago

3 0

Explanation:

Not all elements is viable to form a chemical coumpound, so the 18, is not part of it

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What is the word for the definition of an electron in the highest occupied energy level of an atom

Oliga [24]

<u>Answer:</u> The word for the definition of an electron in the highest occupied energy level of an atom is " valence electron".

<u>Explanation:</u>

A valence electron is an external shell electron associated with an atom in chemistry and physics that can participate in the creation of a chemical bond if the highest occupied energy level of an atom is not closed. All atoms in a single covalent bond add one valence electron to form a mutual pair.

The periodic table showcases the arrangement of valence electrons group and block wise like:

Alkali metals have <em>n </em><em>s</em> 1 as external shell configuration like H, Li, Na, K etc.
Alkaline metals have <em>n</em> s 2 as external hell configuration like Be, Mg, Ca etc.
p-block comprises group 13 to 18 having general electronic configuration <em>n </em><em>s</em> 2, <em>n</em><em> p</em><em> </em>1–6.
d-block or transition metals have general electronic configuration (<em>n</em>-1) d 1–10, <em>n </em>s 1–2.

f-block or inner transition metals have general electronic configuration (<em>n</em>-2) f^1–14 (<em>n</em>-1) d^0-1 <em>n </em>s^2.

6 0

3 years ago

The fundamental frequency of a guitar string is 367 hz . part a what is the fundamental frequency if the tension in the string i

ANTONII [103]

The fundamental frequency of a string is given by:
$f_1 = \frac{1}{2L} \sqrt{ \frac{T}{\mu} }$
where L is the string's length, T the tension and $\mu$ the linear density of the string.

We can see that f1 is proportional to the square root of T: $\sqrt{T}$ .
This means that if the new tension is half the initial value, the new fundamental frequency will be proportional to $\sqrt{ \frac{T}{2} }= \frac{ \sqrt{T} }{ \sqrt{2} }= \frac{f_1}{ \sqrt{2} }$

So, the new fundamental frequency will be
$f_1 ' = \frac{367 Hz}{ \sqrt{2} }=259.5 Hz$

6 0

4 years ago

If the coefficient of static friction between your coffee cup and the horizontal dashboard of your car is µs = 0.800, how fast c

Cloud [144]

Answer:

Before start of slide velocity will be 14.81 m/sec

Explanation:

We have given coefficient of static friction $\mu =0.8$

Angle of inclination is equal to $\Theta =tan^{-1}\mu$

$\Theta =tan^{-1}0.8=38.65^{\circ}$

$tan{38.65^{\circ}}=0.8$

Radius is given r = 28 m

Acceleration due to gravity $g=9.8m/sec^2$

We know that $tan\Theta =\frac{v^2}{rg}$

$0.8=\frac{v^2}{28\times 9.8}$

$v^2=219.52$

$v=14.816m/sec$

So before start of slide velocity will be 14.81 m/sec

3 0

3 years ago

The amount of energy it takes to lift a box might be a function of which of the following?

Nesterboy [21]

The amount of energy it takes to lift a box might be a function of the weight of the objects inside the box. Work is proportional to force and distance. The force of the box is the weight itself of the box. Hence the answer to this problem is B.

5 0

3 years ago

One star might appear brighter than another star because

Marrrta [24]

Answer:

A star's brightness also depends on its proximity to us. The more distant an object is, the dimmer it appears. Therefore, if two stars have the same level of brightness, but one is farther away, the closer star will appear brighter than the more distant star - even though they are equally bright!

Can I have brainliest?

4 0

3 years ago