What element is in the same family as pb but it has fewer protons than na

Calculate the molarity of each aqueous solution: a. 78.0 ml of 0.240 m naoh diluted to 0.250 l with water b. 38.5 ml of 1.2 m hno3 diluted to 0.130 l with water

An unknown substance has been shown to have weak covalent bonds. which of the following is most likely a property of this substance? a. high ph b. high conductivity c. low melting point d. low flammability

How long does it take light from the nearest star other than the sun to reach earth? a) less than 1 second b) about 1 hour c) about 1 month d) about 4 years