nguyên tố hóa học

What information does the atomic number provide?

• Number of protons.

• Number of neutrons.

• 8. Mass number.

• Atomic mass.

The oxygen atom has 8 electrons, what is the charge of its nucleus?

• 8.

• +8.

• 8+.

• 16.

What is the charge of the nucleus in a nitrogen atom?

• 7.

• -7.

• +7.

• 14.

How many protons does a nitrogen atom have?

• 7.

• -7.

• +7.

• 14.

The sodium atom (Na) has 11 protons. What are the nuclear charge and the number of electrons of this atom?

• 11 and 11

• 11+ and 11

• +11 and 11

• +11 and -11

The phosphorus atom has a nuclear charge of 15. What is the atomic number of phosphorus?

• +15

• 15-

• 15 +

• 15

The sulfur atom has a nuclear charge of +16. What is the atomic number of sulfur?

• +16

• 16-

• 16 +

• 16

Which atomic symbol is written correctly?

• 715N

• 16O

• 16S

• Mg1224

Which of the following information about 82206Pb is incorrect?

• The nuclear charge is 82.

• The number of protons and neutrons is 82.

• The number of neutrons is 124.

• The mass number is 206.

Chemical elements are atoms that have the same:

• mass number.

• number of neutrons.

• number of protons.

• Number of neutrons and protons.