In which direction on the periodic table, horizontal or vertical, are elements with similar chemical properties aligned? what are families of elements with similar chemical properties called?

Which of the following statement (s) are true about the atoms of any element? The number of protons in an atom of an element is unique to each element.

6. An ion formed from a single atom has 18 electrons and a charge of + 1. In water, this compound dissociates into ions. Write the chemical symbol for this ion.

What is quantum model of the atom often called.

If 4.35 KJ of heat is added to 15.5 g of water at 5.00 Celsius what will be the result in state and temp of the water

What can be known about all four polymers, despite their differences? They come from living things. They share ionic carbon bonds. They are at least 100 monomers long. They are made of repeating subunits.

4.05 kg + 567.95 g + 100.1 g add the correct value using the correct sig figs and or least precise degree of precision. When i did least degree of precision i got 4718.

Dinitrogen pentoxide gas is formed by the reaction of nitrogen trioxide gas and nitrogen dioxide gas balanced equation

In an experiment to test a new drug's effectiveness, one group is given a larger dosage than is typically prescribed, and a second group is given a smaller dosage than is typically prescribed.

Waves move out through the ground from the source of an earthquake. True or false

The 14C content of a wooden harpoon handle found in the remains of an Inuit encampment in western Alaska is 61.9% of the 14C content of the same type of wood from a recently cut tree. How old is the harpoon?