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Atomic structure and bonding
Which of the following does the nucleus contain?
protons and electrons
protons and neutrons
neutrons and electrons
Which of the following statements is correct?
Protons are positively charged and neutrons are negatively charged.
Protons are negatively charged and electrons are positively charged.
Protons are positively charged and electrons are negatively charged.
What is the atomic number of an atom?
The number of atoms it contains.
The number of protons it contains.
The number of neutrons it contains.
Which of the following statements is true of an atom?
The number of protons is always equal to the number of neutrons.
The number of protons is always equal to the number of electrons.
The number of neutrons is always equal to the number of electrons.
An element has the electronic structure 2,8,4. Which group is it in?
Two elements have these electronic structures: 2,1 and 2,8,1. What can you say about the elements?
They are both in Group 1.
They are both in Group 2.
They are both in period 2.
Which electronic structure is correct for an element with 17 electrons?
What do the elements in a group have the same number of?
occupied energy levels or shells
electrons in the highest occupied energy level or outer shell
What do the elements in a period have the same number of?
Which of these electronic structures belongs to a noble gas?