Which elements in the periodic table are metalloids or have semimetallic properties?

A) N and Br

B) As only

C) Br only

As you go across the periodic table, do atoms get bigger or smaller? Why?

What fact about the cicada demonstrates a pattern observed by scientists?

Where are the lanthanide elements located

What is true of the total mass of reactants compared to the total mass of proucts

When crystalline solid barium hydroxide octahydrate and crystalline solid ammonium nitrate are mixed in a beaker at room temperature, a spontaneous reaction occurs. The temperature of the beaker contents rapidly falls to below 0°C.

After a particularly cold day outside you go home to make some tea. you heat the water in the mug so that botch are about 75 degrees celcious. the tea bag is only 30 degrees celcious and the room is around 26 degrees celcious.

For main-group elements using the older numbering system the group number on the periodic table corresponds to which characteristic of the elements of that group

In the vertical columns of the periodic table, as the atomic numbers increase: a. the number of electron shells increases. b. the ionization energies increase. c. the number of electrons in the valence shell increases. d.

Which of the following solutions contains the largest total concentration of ions, assuming complete dissociation .010 M aluminum chloride .010M sodium chloride .010M aluminum sulfate .010M calcium chloride

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction? a. In equilibrium, the forward reaction rate must be greater than the reverse reaction rate. b.