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4 years ago

The elements in group 17 of the periodic table are called halogens. all halogens have the same?

Physics

2 answers:

77julia77 [94]4 years ago

5 0

Answer: They all have the same valance electrons i.e. 7 valence electrons

Explanation: The elements in-group 7 are often referred as “halogens”. When they form ions, they tend to gain an electron and form negative ions. They are all non-metals and their reactivity down the group decreases because the atomic radius increases in size with an increase of electronic energy level (so fluorine is the most reactive halogen of group 7)

kykrilka [37]4 years ago

4 0

Valence electrons. They all have 7 valence electrons

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Answer:

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4 years ago

A brick and a feather fall to the earth at their respective terminal velocities. Which objectexperiences the greater force of ai

Karo-lina-s [1.5K]

Answer:

Under the reasonable assumption that the brick has more mass than the feather, the brick experiences a greater force of air friction.

Explanation:

Objects at terminal velocity, only under the influence of gravity, have maximized their speed and have an acceleration of zero. Thus, neither object is accelerating.

Recall Newton's second law: $\sum {\vec {F}}=m \vec {a}$

Since acceleration for each object is zero, the sum of the force acting on each of those objects must also be zero.

Since the only forces acting on the objects are gravity and the force of air friction, in order to zero out, the force of air friction must be equal in magnitude and opposite in direction to the force of gravity.

Recall that near the surface of the earth, $F_{gravity}=mg$ , so the Force of Gravity acting on an object is directly proportional to the object's mass. (A similar argument could be made even if this were not taking place on the surface of the earth, so long as the objects were the same distance from the object providing gravitational influence).

If the masses of the objects are different, the object with the greater mass will experience a larger force of gravity, and hence a larger force of air friction at terminal velocity.

Under the reasonable assumption that the brick has more mass than the feather, the brick experiences a greater force of air friction.

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2 years ago

is the following sentence true or false? the faster the particles of a substance are moving, the more energy they have.

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I think true. I'm pretty sure, but check w/ others too.

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3 years ago

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3 years ago