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Vadim26 [7]
2 years ago
15

What element has 5 valence electrons, but more than 7 protons and less than 33 protons?

Physics
1 answer:
MAVERICK [17]2 years ago
7 0

Answer:

Phosphorus (P)

Explanation:

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"In a pure substance all the particles must be identical; therefore pure substances are composed only of elements." Do you agree
kenny6666 [7]

I do not agree with the statement.
The "substance" can be a compound.  It's "pure"
as long as there's nothing else in it but its name.

'Pure' water is 100% H₂O with nothing else in it.
'Pure' table salt is 100% NaCl with nothing else in it.
'Pure' carbon dioxide is 100% CO₂ with nothing else in it.

These example substances are all compounds, not elements.
 
6 0
3 years ago
A 100-N force causes an object to<br> accelerate at 2 m/s/s. What is the<br> mass of the object?
Kitty [74]

Answer:

50\; \rm kg.

Explanation:

By Newton's Second Law, the acceleration a of an object is proportional to the net force \sum F on it. In particular, if the mass of the object is m, then

\sum F = m \cdot a.

Rewrite this equation to obtain:

\displaystyle m = \frac{\sum F}{a}.

In this case, the assumption is that the 100\; \rm N force is the only force that is acting on the object. Hence, the net force \sum F on the object would also be

Make sure that all values are in their standard units. Forces should be in Newtons (same as \rm kg \cdot m \cdot s^{-2}, and the acceleration of the object should be in meters-per-second-squared (\rm m \cdot s^{-2}). Apply the equation \displaystyle m = \frac{\sum F}{a} to find the mass of the object.

\displaystyle m = \frac{100\; \rm N}{2\; \rm m \cdot s^{-2}} = 50\; \rm kg.

4 0
3 years ago
??? True or false. An element can only exist as an individual atom.
KengaRu [80]
I think it's false because Oxygen is diatomic so it's found as O2 which means that it has two atoms of itself.
7 0
3 years ago
You are riding on a school bus and suddenly get thrown forward. What did the bus just do?
sergij07 [2.7K]
The bus is going forward and suddenly stops
5 0
2 years ago
What is Force!????!?​
spin [16.1K]

A force is a push or pull upon an object resulting from the object's interaction with another object.

4 0
2 years ago
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