Which of the following electron configurations for neutral atoms is correct?

helium: 1s1, 1p1

nitrogen: 1s2, 2s2, 2p3

silicon: 1s2, 2s2, 3s2, 2p63p2

the third sub-level

Li

if a rock has a speed of 12 m/s as it hits the ground, from what height did it fall assuming the speed was zero. its mass is 50 kg

Moon phases are named after the shape the moon resembles during that time. What is is called when the shape of the moon is between a half circle and a full circle. crescent semi-full three-fourths gibbous

What is one way space travel affects the human body?

Is walking just a constant state of falling?

Lactic acid is the cause of muscle fatigue. A. True B. False

wavelength of a light whose second-order dark band forms a diffraction angle of 15.0° when it passes through a diffraction grating that has 250.0 lines per mm

If a fully loaded shopping cart has a head-on collision with an empty cart both moving at the same speed toward each other, which cart experiences the greater force? The greater impulse? The greater change in momentum? The greater acceleration?

Why didn't early Portuguese and Dutch explorers decide to create settlements in Australia

How do the electrons in the bulb's filament, far from the battery and its emf, "know" that they should flow?

What occurs when an unstable atomic nucleus changes into other nuclei by emitting particles and energy