How many valence electrons are there in group viia elements

What is the force needed to accelerate a sled with a mass of 2 kg at a rate of 3.0 m/s2 A 2.0 B 1.5 C 3.0 D 6.0

A wire carries a current of 6.91 A in a direction that makes an angle of 19◦ with the direction of a magnetic field of strength 0.289 T. Find the magnetic force on a 6.7 m length of the wire. Answer in units of N.

What connection does salt have with acids and bases?

When is acceleration positive, negative, and zero? Calculate the average speed if I walk to class at a speed of 20 meters/minute for the first 2 minutes and run when they start to play 21 savage at a rate of 50 meters/minute for the last 3 minutes.

What is the most advanced life form on earth

What conclusion can be drawn from the statement that an element has high electron affinity, high electronegativity, and a high ionization energy? A) The element is most likely from Group 1A or 2A and in period 1 or 2.

When a cyclist rides past you on the street, this is an example of

Why are galaxies visible

I hockey puck slides across an ice rink more easily than it does across a rough concrete surface why is this

Sodium-22 Sodium-25 # of protons # of neutrons # of electrons