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3 years ago

From the illustration of the potassium atom, fill in the periodic table selection.

Physics

1 answer:

stich3 [128]3 years ago

3 0

Answer:

2 in shell 1; 8 in shell 2; 8 in shell 3 and 1 in shell 4 ; 19 total protons and electrons

Explanation: Potassium is in Group 1 Period 4 and will have 1 valence electron that is 4s1 electron configuration.

Atomic mass =

39.10 = 19 protons + 20 neutrons

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The table below shows some common animals and their hearing range in Hertz (Hz). Animal Hearing Range in Rate of Vibrations per

kap26 [50]

Answer:

Explanation:

If you list and compare, the elephants hearing range is the closest to a humans.

Humans: 20-20,000

Elephant: 16-12,000

While the others are either too much more or less than a humans.

Bat: 2,000-110,000

Dolphin: 90-105,000

Chicken: 125-2,000

5 0

3 years ago

elements found in the same ______ have similar chemical properties. What should go in the blank? Row or column?

Temka [501]

The answer is Column, however if you want to know the scientific word for it, it is also known as a group

(extra fact, a row is called a period)

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4 years ago

The number 3 in hydrogen in NH33 is the

frosja888 [35]

Answer:

no of atoms

Explanation:

for each amonia molecule one nitrogen atom bind with 3 hydrogen atoms

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3 years ago

With a 900 V source, voltage is divided across 3 series resistors of 300 V, 280 V, and:

telo118 [61]

Answer:

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3 years ago

Can a average velocity be zero.Why?

marishachu [46]

<u>Answer:</u>

Yes

<u>Explanation:</u>

Average velocity is the ratio of total displacement and time taken for that displacement:

$average \space\ velocity = \frac{displacement}{time}$

This means if displacement is zero, then average velocity will also be zero.

Displacement is zero when an object moves some distance in one direction, and then moves the same distance but in the opposite direction.

∴ As it is possible for displacement to be zero, it is also possible for average velocity to be zero.

4 0

2 years ago