What are the characteristics distinguishes helium (He) from the other noble gases

A. Helium has two valence electrons

B. Helium has a milky-white color

C. Helium has a strong odor

D. Helium is highly reactive

What would happen eventually to a balloon sitting in a sunny window? Which gas predicts this?

What is a mirage? explain the under which it is seen.

circular saw blade of diameter 0.190 m starts from rest. In a time interval of 5.80 s it accelerates with constant angular acceleration to an angular velocity of 145 rad/s. Part A Find the angular acceleration.

What is the cause of mass wasting a. kinetic energy b. thermal energy c. gravity d. expansion

Which of the changes occurs when energy is absorbed?

What does Kepler's second law state? A. Planets travel in ellipses. B. Planets sweep equal areas in equal times. C. A planet's apparent backward movement is termed retrograde motion. D.

Why do charges build up in a cloud

How does the wave model of electrons orbiting the nucleus account for discrete energy values?

An ecosystem is all the populations of organisms that live together and A. the microorganisms that depend on them. B. the organisms that generate energy from sunlight. C. the physical factors with which they interact. D.

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.