What is the number of valence electrons in a nitrogen atom in the ground state

Which is true of transition metals when moving from left to right on the periodic table? the d sublevels are not filled across the period. the cation radii become larger across the period. atomic radii increase slightly and then start to decrease. atomic radii decrease slightly and then start to increase. o

Express the following number in scientific notation. 0.026890 =

How have the greenhouse gasses increased from the year 2000 to 2018