The main-group elements are the forty-four elements that occupy groups 1A-8A of the periodic table. Main-group elements are important because of their high natural abundance both in the Earth's crust and in the human body and are commercially valuable.
Review the families containing main group elements. Identify all the characteristics that apply to the elements in family IA.
A)
They are highly reactive.
B)
They are shiny, soft metals.
C
The elements form +1 ions when forming compounds.
D)
The elements gain electrons when forming compounds.
E)
As you move down the family, number of valence electrons increases,

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.