Answer:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.
Each row represents one period; the period number of an element indicates how many of its energy levels house electrons. Sodium, for instance, sits in the third period, which means a sodium atom typically has electrons in the first three energy levels.
Explanation:
Explanation:
1)observation is that the light doesn't reach some parts of the points of interest
2)this is because the rays of the light were interrupted by different objects thus making the light divert different ways.
Answer: 3.45 L carbon dioxide are produced
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 
of particles.
To calculate the moles, we use the equation:
According to stoichiometry :
5 moles of 
produce = 3 moles of 
Thus 0.257 moles of will produce=
of
Volume of 
Thus 3.45 L carbon dioxide are produced
Answer:
5 protons, 6 neutrons, and 5 electrons.
Explanation:
An isotope is an element which has the same number of protons. However, it has a different number of neutrons. A proton has a positive charge. A electron has a negative charge and a neutron has no/neutral charge. They are five protons because the atomic number is 5. Furthermore, atomic number gives you the number of protons. They are six neutrons since 11 - 6 = 5. You use the atomic mass to find that out. In order to find the atomic mass, it is number of protons + the number of neutrons. They are five electrons since the isotope is a neutral atom. Unless it is an ion, there won't either be an increase or decrease in electrons. An ion is an element that either has a positive or negative charge. For example, if Lithium has 3 protons, 4 neutrons, and 5 electrons, then lithium has an 2- charge. It has two more electrons more than protons. Therefore, it is written as li^2-. Another example is if Carbon has 6 protons, 6 neutrons, and 2 electrons, then Carbon has a +4 charge. It has four more protons than electrons. Therefore, it is written as C^+4.
Don't forget this; thank you. (I take AP Chemistry).
