For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?

A. 13

B. 14

C. 26

D. 27

E. 40

How do I shut my brother up

Determine qual é a carga elétrica de um corpo que possui 1 milhão de partículas?

A 50kg meteorite moving at 1000 m/s strikes Earth. Assume the velocity is along the line joining Earth's center of mass and the meteor's center of mass. What is the gain in Earth's Kinetic Energy?

Which of the following is true of the planet jupiter

You are pedaling a bicycle at 9.8 m/s. the radius of the wheels of the bicycle is 51.9cm. the angular velocity of rotation of the wheels is

For glass fragments to be individualized, what must be true? A. They must fit together B. They must have the same density C. They must look the same D. They must be the same color

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.870 m/s at an angle of 35.0° above the table, and it lands on the magazine 0.0770s after leaving the table. Ignore air resistance.