What is the name of chart scientists use to group together elements with similar properties?

A number has a atomic number of 9 and an atomic mass of 19 amu. how many protons and how many neutrons are present in the atom

Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond? They have a frequency of 2 hertz.

If a rock weighing 2,200 N is dropped from a height of 15 m, what is its kenetic energy just before it hits the ground

What is the current when the voltage is 18 volts and the resistance is 6 ohms? 108 amps 12 amps 24 amps 3 amps

A player bounces a basketball on the floor, compressing it to 80.0 % of its original volume. The air (assume it is essentially N2 gas) inside the ball is originally at a temperature of 20.0 ∘C and a pressure of 2.00 atm. The ball's diameter is 23.

What is the value of g in m/s^2, rounded to one decimal place

There is a naturally occurring electric field near the surface of the Earth whose magnitude is 80√pi V/m. How much energy is stored per cubic meter in this field?

During the Pleistocene, a land bridge connected Alaska and Asia. What could have caused this bridge to from? the ending of an ice age the beginning of an ice age the erosion of the Alaskan coastline the erosion of the Asian coastline

A rock is shot vertically upward from the edge of the top of a tall building. The rock reaches its maximum height above the top of the building 1.60 s after being shot.

Which of the following effects does low nitrogen availability most likely have on the carbon cycle? a. more carbon dioxide is taken up by plants b. carbon dioxide is trapped in the soil around plants c.