CHEM ch 2 Tanizaki

Show that the total charge of a carbon atom is zero. The number of protons in a carbon atom is six. Because each proton carries "+1" charge, six protons amount to "+6" charges. The number of electrons in a carbon atom is also six. Because each electron carries "-1" charge, the total charge of six electrons is "-6". The net charge is the sum of these charges.

(+6) + (-6) = 0 Therefore, a carbon atom is an electrically neutral object.

Arrange the following elements in increasing order of size. N F Ca

.F < N < Ca

How many carbon-13 isotopes are present in 1000 carbon atoms taken from a typical sample found in nature? Answer the question according to the data given in the table below. Isotope. Natural abundance Mass(in amu) 12^C 98.90% 12.000 13^C 1.10% 13.003

11 carbon-13 atoms

Determine the average mass of 1000 carbon atoms in problem 14 according to the data given in problem 5. Round your answer to two decimal places.

12.01 amu

Convert the mass of 142 lb into atomic mass units. Express your answer in scientific notation.

3.88 × 10^28 amu

Determine the percentage of metalloids in the periodic table (Appendix A). Round your answer to the nearest integer.

4%

How many protons are present in one gold atom? How many electrons are present? Hint: gold is (Au)

79 protons and 79 electrons.

Explain why an atom is considered an electrically neutral object.

An atom is considered an electrically neutral object because the number of protons is equal to the number of electrons. The positive charge of the protons is canceled out by the negative charges of the electrons.

What is the atomic symbol for an element whose group number is 5A and period number is 6?

Bi

Arrange the following elements in increasing order of metallic character. Cl Cs P

Cl < P < Cs

By using the atomic number in the periodic table, you can find the number of protons and the number of electrons in an atom of each element. Nitrogen and potassium Element/Atomic Sym/Atomic#/#of (+) /#of(-) (+)= proton (-)= electron

Element/Atomic Sym/Atomic#/#of (+) /#of(-) Nitrogen N. 7. 7. 7 Potassium K 19. 19. 19

Does tungsten belong to the main-group elements?

No, tungsten does not belong to the main-group element. It is a transition element.

Isotope: 14^ N Has how many protons, neutrons, and electrons? Hint: by using the atomic numb in the periodic table you can find the number of protons and electrons of each element. also, the atomic number is located at the top of the atomic symbol * i think that for the number of neutrons you subtract the protons from the mass number

Protons. Neutrons. Electrons 7 7 7

Isotope: 16^N has how many protons, electrons, and neutrons? Hint: by using the atomic numb in the periodic table you can find the number of protons and electrons of each element. also, the atomic number is located at the top of the atomic symbol

Protons. Neutrons. Electrons 7. 9. 7

Isotope: 15^N Has how many protons, neutrons, and electrons ? Hint: by using the atomic numb in the periodic table you can find the number of protons and electrons of each element. also, the atomic number is located at the top of the atomic symbol

Protons. Neutrons. Electrons 7. 8. 7

Arrange electrons in a phosphorus atom in shells.

There are fifteen electrons in a phosphorus atom. Two electrons are in the first shell (n = 1), eight electrons are in the second shell (n = 2), and five electrons are in the third shell (n = 3).

Arrange electrons in a chlorine atom in shells.

There are seventeen electrons in a chlorine atom. Two electrons are in the first shell (n = 1), eight electrons are in the second shell (n = 2), and seven electrons are in the third shell (n = 3).