Question

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only 5 number​

Answer 1

The current model of atomic structure is the quantum mechanical model. Traditional chemistry starts with the study of elementary particles, atoms, molecules, substances, metals, crystals and other aggregates of matter.

Answer 2

Answer:

length 42cm and breadth 24cm

Explanation:

Let the length be 7× and breadth be 4×

2(7×+4×) 25 = 3300

50×11×=3300

11× = 3300÷50

11×66

x=66÷11

x=6

So length is 7×6=42cm and breadth is 4×6=24cm

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