Ch4&5 physical science, atomic theory & periodic table

How many electrons does the element chlorine (Cl, atomic #17) have if it has a charge of -1

The most reactive of the alkali metals is which element

In which group are the halogens located

Which type of element makes up most of the periodic table

Which of the following period 2 elements would be a poor conductor of electricity 

In the current model of the atom, electrons are located where

What did Bohr observe that caused him to hypothesize atomic orbitals

On which side of the periodic table are the metals located

Who worked with cathode rays to discover the electron? 

On the periodic table, elements with similar properties are placed in vertical columns called

Mendeleev arranged the elements in order of increasing

Who hypothesized the nucleus when the alpha particles he was shooting at an atom bounced back? 

How many electrons does the element chlorine (Cl, atomic #17) have if it does not have a charge

Which color represents period three on the periodic table below

How many energy levels are in a Lithium atom?