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3 years ago

How are electrons arranged around the nucleus of an atom

2 answers:

6 0

Electrons are arranged in shells around the nucleus. Electrons closest to the nucleus have the lowest energy. Electrons further away from the nucleus have a higher energy.

Lubov Fominskaja [6]3 years ago

5 0

Answer: electrons are arranged in shells around an atom's nucleus.

Explanation:

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Signs of a chemical change

dezoksy [38]

Answer: There are five signs of chemical change

Color Change
Production of an odor
Change of Temperature
Evolution of Gas (bubbles start to form)
Precipitate (starts to form a solid)

When these signs start to form you know chemical change is at work.

Hope this helps :)

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3 years ago

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based on the cause and effect relationship between the magnets, which phenomenon is the teacher modeling for her students.

faltersainse [42]

Answer:

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Explanation:

8 0

2 years ago

4. DBearded waste of Co-60 must be stored until it is no longer radioactive. Cobalt-60

Bingel [31]

464 g radioisotope was present when the sample was put in storage

<h3>Further explanation</h3>

Given

Sample waste of Co-60 = 14.5 g

26.5 years in storage

Required

Initial sample

Solution

General formulas used in decay:

$\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}$

t = duration of decay

t 1/2 = half-life

N₀ = the number of initial radioactive atoms

Nt = the number of radioactive atoms left after decaying during T time

Half-life of Co-60 = 5.3 years

Input the value :

$\tt 14.5=No.\dfrac{1}{2}^{26.5/5.3}\\\\14.5=No.\dfrac{1}{2}^5\\\\No=\boxed{\bold{464~g}}$

8 0

3 years ago

The main function of the circulatory system (at least a paragraph)!

SIZIF [17.4K]

The circulatory system moves blood in our bodies. The blood can move oxygen and nutrients to our muscles and limbs. The heartbeat pushes the blood, and the blood cells carry glucose.

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3 years ago

Define organic chemistry and inorganic chemistry.

MrRissso [65]

Organic is safer inorganic is the same but less better

3 0

3 years ago

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How are electrons arranged around the nucleus of an atom​

How are electrons arranged around the nucleus of an atom