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Technetium is an element commonly used in medicine. A technetium atom is represented as ^99 _43 Tc. Give the number of protons, neutrons and electrons in this atom of technetium.

⁹⁹₄₃Tc (how it should be represented in question)
Number of protons = 43 Number of neutrons = 56 Number of electrons = 43
Technetium is given here in nuclear notation. This...

Answered by Daniel J. • Chemistry tutor

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Explain the stages of Piaget's theory of cognitive development (4 marks).

Piaget's theory of cognitive development has four main stages of mental development in children. It focuses on how children acquire knowledge throughout their childhood, in a stage-like fashion, as oppose...

Answered by Shona W. • Psychology tutor

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A car travelling at 28 m/s brakes until it stops completely after travelling a distance of 15 m. Calculate the deceleration of the car.

· Firstly, we need to note down what we have: distance travelled, s =15 m; initial velocity, u = 28 ms^-1; final velocity, v = 0 because the car comes to rest; we are looking for the dece...

Answered by Oluyomi S. • Physics tutor

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