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docker41 [41]
3 years ago
6

According to its periodic table entry, how many electrons does nickel have in its valence level?

Physics
2 answers:
steposvetlana [31]3 years ago
5 0

2 valence electrons

Explanation:

Electron configuration of nickel (Ni):

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸

The valence electrons are in the electronic shell with the higher principal quantum number (n). In our case, nickel have 2 electrons in the 4s², with the n = 4.

Learn more about:

electrons in the valence level

brainly.com/question/5523364

brainly.com/question/8320786

#learnwithBrainly

Anna11 [10]3 years ago
4 0

Answer:

Nickel has 2 electrons in its valence level.

Explanation:

The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).

There are 7 energy levels, numbered from 1 to 7. Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.

According to the periodic table entry, you can see that the nickel has an electronic configuration of [Ar] 3d⁸ 4s²

The number that precedes the representative letter of each orbital or sub-level indicates the level of energy where the electron is located, the letter indicates the type of orbital or sub-level where the electron is located and the exponent indicates the number of electrons found in the orbital.

Note that Ar is the noble gas of the previous period. In square brackets, as shown in the case of nickel, indicates the internal electronic structure of the element. So the electronic configuration of the nickel is:

1s² 2s² 2 p⁶ 3s² 3p⁶ 3d⁸ 4s²

Valencia electrons are the electrons found in the last electronic layer (called valence orbitals).  The last electronic layer is the layer furthest from the nucleus, which in this case can be seen to be the electronic layer or level 4.  At this level you can see the letter s, which, as mentioned, indicates the type of orbital where the electrons are located, and the exponent 2, which indicates the number of electrons found in said orbital.

So, <u><em>nickel has 2 electrons in its valence level.</em></u>

<u><em></em></u>

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skateboard b

Explanation:

p=mv

skateboard a

p=(60kg)(1.5m/s)=90kg*m/s

skateboard b

p=(50kg)(2m/s)=100kg*m/s

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3 years ago
Unit of speed is derived unit why​
madam [21]

Answer:

Explanation:

Therefore, the unit of speed is the meter per second, or m/s. The unit meter per second is called a derived unit, meaning that it is derived from the seven SI base units.

7 0
3 years ago
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The brain mass of a human fetus during a particular trimester can be accurately estimated from the circumference of the head by
Paladinen [302]

Answer:

a. If c = 20 cm, then the mass of the brain is m = 5 g.

b. At c = 20 cm, the brain's mass is increasing at a rate of 15.75 g/cm.

Explanation:

From the equation

m\left(c\right) = \frac{c^3}{100}-\frac{1500}{c}

we have

a. for c = 20 cm

m\left(20\right)=\frac{20^3}{100}-\frac{1500}{20}=5,

then the mass is m(20) = 5 g.

b. In order to find the rate of change, first we derivate

\frac{dm}{dc}=\frac{3c^2}{100}+\frac{1500}{c^2}.

Evaluated at c = 20 cm, we have

\frac{dm}{dc}|_{c=20}=\frac{3\times 20^2}{100}+\frac{1500}{20^2}=15.75.

So, at c = 20 cm, the mass of the brain is increasing at a rate of 15.75 g/cm.

3 0
3 years ago
The curved section of a speedway is a circular arc having a radius of 190 m. this curve is properly banked for racecars moving a
Anestetic [448]

The banking angle of the curved part of the speedway is determined as 32⁰.

<h3>Banking angle of the curved road</h3>

The banking angle of the curved part of the speedway is calculated as follows;

V(max) = √(rg tanθ)

where;

  • r is radius of the path
  • g is acceleration due to gravity

V² = rg tanθ

tanθ = V²/rg

tanθ = (34²)/(190 x 9.8)

tanθ = 0.62

θ = arc tan(0.62)

θ = 31.8

θ ≈ 32⁰

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8 0
2 years ago
Which electromagnetic waves have the shortest wavelengths and highest frequencies?
Usimov [2.4K]

Answer: Gamma rays

Explanation: The given waves belong to the electromagnetic spectrum which consists of different electromagnetic radiations arranged in terms of increasing wavelengths or decreasing frequencies.

E= h\times \nu

\nu=\frac{c}{\lambda}

Thus E=\frac{h\times c}{\lambda}

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c = speed of light

\lambda = wavelength

Thus frequency and wavelength are inversely related. The waves having high energies ave high frequencies and have shorter wavelengths.

Thus gamma rays having highest energy have highest frequency and shortest wavelength.


3 0
3 years ago
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