10. Periodic Properties of the Elements

Which element has 3 energy levels and 4 valence electrons?

How many valence electrons does strontium (Sr) have?

Where are the valence electrons of an atom located?

What is the valence electron configuration for the silicon atom?

How many valence electrons are represented around the Lewis symbol for a selenium (Se) atom?

An atom has 6 electrons in its outer shell. How many unpaired electrons does it have?

How many electrons occupy the outer energy level of most atoms that are chemically stable?

How many electrons occupy the third energy level (n = 3) in a neutral sodium (Na) atom?

Which electrons are primarily involved in chemical reactions?

How many valence electrons does helium (He) have?

Arsenic is a metalloid. How many valence electrons does arsenic have?

Which part of an atom determines how it will react with other atoms?

How many valence electrons does an atom of the element neon (Ne) have?

How many electrons are required to complete the outer energy level (valence shell) of a phosphorus atom?

How many valence electrons does a neutral atom with 15 protons have?