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2 years ago

ANSWER IS A As you move from left to right across Period 3, which statement is true of the number of

Physics

2 answers:

frosja888 [35]2 years ago

8 0

Answer:

READ YOUR QUESTION CAREFULLY:

If it says left to right, the answer is A. The number of valence electrons increases by 1.

If it says right to left, the answer is B. The number of valence electrons decreases by 1.

Good luck :)

Sedbober [7]2 years ago

7 0

Answer:

A. The number of valence electrons increases by 1.

Explanation:

As you move across any period on the periodic table, the number of valence electrons increases by a value of 1.

The periodic table of elements contains an arrangement of element by their atomic numbers.
From left to right, number of valence electrons increases.
Down a group, the valence electrons are the same.
Across a period, the number of valence electrons increases.

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3 years ago

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3 years ago

A 12.0-cm long cylindrical rod has a uniform cross-sectional area A = 5.00 cm2. However, its density increases linearly from 2.6

andriy [413]

Answer:

(a) The constants required describing the rod's density are B=2.6 and C=1.325.

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Explanation:

(a) Since the density variation is linear and the coordinate x begins at the low-density end of the rod, we have a density given by

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(b) The mass of the rod can be found by having into account the density, which is x-dependent, and the volume differential for the rod:

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3 years ago

A child throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. The ball leaves her hand 1.00

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Answer:

Explanation:

initial velocity, u = 8 m/s

vertical height, h = 1 m

θ = 40°

Let the horizontal distance is d and the time taken is t.

Use second equation of motion in vertical direction

h = ut + 1/2 at²

1 = 8 Sin 40 x t + 0.5 x 9.8 t²

1 = 5.14 t - 4.9t²

4.9t² - 5.14 t + 1 = 0

so, t = 0.26 s (smaller value)

So, the horizontal distance is

d = u cos 40 x t

d = 8 cos 40 x 0.26

d = 1.6 m

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2 years ago

** ANSWER IS A** As you move from left to right across Period 3, which statement is true of the number of

ANSWER IS A As you move from left to right across Period 3, which statement is true of the number of