Elements, Atoms, Ions, And The Periodic Table Worksheet With Answers Page 12
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14Sample Test Chapter 3
1. Which two scientists in 1869 arranged the
Periodic Table?
elements in order of increasing atomic masses
Ans. the group number (Roman numbers with
to form a precursor of the modern periodic
Bs) is also the number of valence electrons
table of elements?
14. How many orbitals are in an s sublevel?
Ans. Mendeleev and Meyer
How many in a p sublevel?
2. Who stated that the elements, when arranged
Ans, 1; 3
according to their atomic masses, showed a
distinct periodicity of their properties?
15. In what way(s) are the three orbitals in the
Ans. Dimitri Mendeleev
2p sublevel similar; in
what way(s) are they different?
3. In the modern periodic table, the elements are
Ans. they have the same shape and the same
arranged according to what system?
energy; they are oriented
Ans. increasing atomic number
differently in space
4. The modern periodic law states that the
16. What requirement must be met in order for
physical and chemical properties of the
two electrons to coexist in
elements are periodic functions of what
the same orbital?
property?
Ans. they must have opposite spins
Ans. atomic number
17. State the Aufbau Principle.
5. What do we call the horizontal row of
Ans. Electrons occupy the available orbital of
elements on the periodic table?
lowest energy first.
Ans. periods
18. How many electrons are present in an atom
of silicon?
6. How many periods are found on the periodic
table?
Ans. Fourteen
Ans. seven
19. Give the electronic configuration in an atom
7. Which period contains the element sodium?
of argon, element number
Ans. three
18.
Ans. 1s22s22p63s23p6
8. What do we call the columns of elements on
the periodic table?
20. Give the electronic arrangement in an atom
Ans. groups
of strontium, element number 38.
Ans. 1s22s22p63s23p64s23d104p65s2
9. What number for an atom gives the number
of electrons and protons found in that atom?
21. How many electrons are present in a
Ans. atomic number
chloride ion?
Ans. Eighteen
10. Where are the alkaline earth metals located
22. State the Octet Rule.
on the periodic table?
Ans. Elements tend to react in such a way as to
Ans. Group IIA (2)
attain the electron configuration of the atoms of
the noble gas nearest to them in the Periodic
11. What is the general name given to the
Table
elements of Group VIIA (17)?
Ans. Halogens
23. Give the name of a Group IA (1) ion that
has the following electronic arrangement:
2
2
6
12. What term is used for the elements
1s
2s
2p
straddling the "staircase" boundary between the
Ans. sodium ion
metals and nonmetals?
Ans. Metalloids or semi-metals
24. Give the name of a VIIA (17) ion that has
the following electronic
13. For a representative element, how can we
arrangement: 1s22s22p63s23p6
deduce the number of valence electrons in a
Ans. chloride
neutral atom from the position of the element in
25. What ion carries a 2- charge and is
+
the
isoelectronic with K
?
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