Talk in english plz

Mass number = Number of protons + Number of neutrons

For a neutral atom, the number of electrons is equal to the number of protons, so there are 15 electrons.

The electron arrangement for 15 electrons is 2, 8, 5.
Electron arrangement: $\boxed{\text{2, 8, 5}}$

b) State the group and period to which element E belongs.

The number of valence electrons (electrons in the outermost shell) is 5, so the element is in Group V (or 15).
The number of electron shells is 3, so the element is in Period 3.
Group: $\boxed{\text{V}}$
Period: $\boxed{\text{3}}$

c) Draw a labeled diagram showing the atomic structure of E.

Your diagram should show a nucleus containing 15 protons and 16 neutrons. It should also show three electron shells with 2 electrons in the first shell, 8 electrons in the second shell, and 5 electrons in the third (outermost) shell.

2. The diagram below shows an arrangement that can be used to react magnesium ribbon with steam.

a) Write a balanced chemical equation for the reaction that produces hydrogen gas.

Magnesium (Mg) reacts with steam (H₂O(g)) to produce magnesium oxide (MgO) and hydrogen gas (H₂).

b) Explain the precaution that should be observed at the end of the experiment before heating is stopped.

To prevent water from being sucked back into the hot boiling tube (suck-back), which could cause it to crack, the delivery tube must be removed from the water trough before the heating is stopped.
Precaution: $\boxed{\text{The delivery tube should be removed from the water before stopping the heating.}}$

c) Explain the industrial use of the product formed in the boiling tube at the end of the experiment.

The product formed in the boiling tube is magnesium oxide (MgO).
Industrial use: $\boxed{\text{It is used as a refractory material for lining furnaces due to its high melting point.}}$