what element is Zr?

Susan drinks black coffee from a mug. The coffee has _____________. (properties)

Why do elements within a group have similar chemical properties?

Why is the human body a good conductor of electricity?

Dry ice is used in fire extinguishers. The dry ice is stored in the cylinder in a solid form. When sprayed on a fire it quickly changes into the gas known as Carbon Dioxide (CO2). What is this change of state called?

What is the symbol for element Roentgenium?

What type of microscope uses electrons to provide a three-dimensional view of the surface of the object?

Aluminum is used for making cooking utensils. Which of the following properties of Aluminum are responsible for the same? I. Good thermal conductivity II. Good electrical conductivity III. Ductility IV. High melting point

Scientists have discovered a new substance on a distant planet. It has mass, definite volume, but cannot be compressed. What is its state of matter?

Daisy poured some water into a glass. Then he dropped a marble into the glass of water. He noticed that the level of water rose. The rise in water level indicates _________.

These pictures show different models of the atom proposed by scientists. The proper arrangement from oldest to most recent would be __________.

Why was Democritus’s original atomic theory revised?