Answer:
Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
Explanation:
The mass number is given at the top left of the elements symbol, for example, sodium has a mass number of 23.
Sodium (Na) square from the periodic table. The mass number (23) is top-left. The atomic number (11) is bottom-left.
We know that the atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons.
The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass).
Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
Answer:
b.
They can convert the sun's energy into food.
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Answer:
Green design is the correct answer
Explanation:
Green design is a method of constructing buildings that are healthy, comfortable and buildings are created by this approach reduces the harmful effects of the construction on the human health and environment.
In the green design method, eco-friendly substances are used for construction.
Green design does not generate waste and it improves and enhances the environment.