Students build a model of a lithium atom with different colored marbles. Lithium Model Information Number of Marbles Blue (protons) 3 Green (neutrons) 4 Red (electrons) 3 Based on the chart, which marbles should the students place in the nucleus of their lithium atom model?(8th grade science)

Blue and Green marbles

Explanation:

We have been given that:

       Number of Marbles:

  Blue(Protons)  = 3

  Green(Neutrons)  = 4

   Red (Electrons)  = 3

The marble that should be placed in the nucleus of a lithium atom  = ?

Solution:

The nucleus of an atom is made up of protons and neutrons.

Protons are the positively charged particles in an atom.

Neutrons do not carry any charges.

  So;

The marble in the nucleus are the Blue and Green marbles.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

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