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What is the ground state electron configuration for the nitride ion (N3-)?

Elements such as boron, silicon, and arsenic, are examples of:

The O2- ion has how many protons and electrons?

When a 45.0 g sample of an alloy at 100.0°C is dropped into 100.0 g of water at 25.0°C, the final temperature is 37.0°C.  What is the specific heat of the alloy?  The specific heat of H2O(l) is  4.184 J∙g–1∙°C–1. 

A 1200. g piece of rock (cs = 0.790 J/g°C) at 60.00°C is placed in a bucket of water. At equilibrium, both the rock and the water have a final temperature of 24.00°C. How much water (cs = 4.18 J/g°C), initially at 18.00°C, was in the bucket?

If the following operations were carried out, how many significant figures would the answer contain? 0.750 x 11 / 9.250 =

When this equation is balanced with the smallest set of whole numbers, what is the coefficient for SO2?  ___FeS2(s) + ___O2(g)

What is the ground state electron configuration for the sulphide ion (S2-)?

Which of the equations below does not show the standard heat of formation of a compound?