Name two elements that hace properties similar to those of the element calcium (ca).

Un elemento posee dos isótopos cuyos números de masa suman 68 y la semisuma de sus neutrones es 19. Determine el grupo de este elemento en la Tabla Periódica Actual.

Which is larger F-1 or F and why?

2. An object experiences an acceleration, g, when it is on the surface of a planet of radius R. What will be the acceleration on the object after it has been moved to a distance of 4R from the center of the planet? A) 168 B) 48 C) 1/4 g D) 1/16 g

What is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge? nuclide proton electron isotope.

Where did the periodic table come from

Which is a product in the following chemical reaction? CH4 + 2O2 → CO2 + 2H2O CH4 H4 H2O O2

How many Mg atoms are present in 170g of Mg

The kinetic theory assumes that collisions of gas particles are perfectly elastic. What does this statement mean?

Roger believes that he is following a healthy regime by taking lots of vitamin E everyday. What property of vitamin E makes Roger's practice potentially unhealthy?

A 68-kg man whose average body temperature is 39°C drinks 1 L of cold water at 3°C in an effort to cool down. Taking the average specific heat of the human body to be 3.