The horizontal rows of elements in the periodic table are called

a. periods.
b. groups.
c. families.
d. series.


a

Physics & Space Science

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Double-Slit Interference: In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.100 mm. If the first-order bright fringe is measured to be 3.40 cm from the centerline, what is the wavelength of the light?

A. 354 nm B. 241 nm C. 133 nm D. 3.09 ?m E. 2.11 ?m

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Why does the Moon play a larger role in tides than the Sun?

What will be an ideal response?

Physics & Space Science

You are holding your physics book, pushing upwards on it with the palm of your hand. The reaction to this force is the force on __________ by __________

Fill in the blank(s) with correct word

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How many degrees of hardness are defined

on the Mohs hardness scale? a) 3 b) 7 c) 10 d) 12

Physics & Space Science