Hi,
This assignment counts a lot for my grade and I'm quite uncertain about these answers. If any are wrong, explanations are greatly appreciated. Thank you for your help,
1.) The number of electrons in the outer ring of the elements in Group II of the Periodic Table is (2)
1
2
3
4
2.) The number of neutrons in the nucleus of an atom of 3Li7 is (4)
10
7
3
4
3.) The element with atomic number 7 is likely to have properties similar to the element whose atomic number is (15)
11
2
15
17
4.) The chloride ion has the same number of orbital electrons as an ion of (Ar)
Ar
K
Mg
Na
5.) The number of neutrons in the nucleus of the element of atomic number 79 and atomic weight 197 is (276)
79
118
197
276
6.) The element of atomic number 87 is (metallic)
amphoteric
inert
metallic
non-metallic
7.) The atom whose nucleus contains the largest number of neutrons is (Option 4)
92U235
92U239
93Np239
94Pu239
8.) Element No. 19 is more active than element No. 11 because element No. 19 (Option 3)
is amphoteric
is a metal
has its valence electron farther from the nucleus
has its valence electron nearer the nucleus
9.) Two man-made elements with atomic numbers greater than 92 are (americium and curium)
americium and curium
thorium and actinium
U238 and U239
U235 and U238
10.) The particle which has the same number of orbital electrons as a potassium ion is (S-2)
Ce+3
K0
Ne0
S-2
11.) The atomic number of an element that is chemically like magnesium is (5) (?)
5
9
14
20
12.) Atoms of U-235 and U-238 differ in structure by three (neutrons)
electrons
mesons
neutrons
protons
13.) Tritium, an isotope of hydrogen, has an atomic number of (1)
1
2
3
4
14.) The maximum number of electrons possible in the second ring (shell) of an atom is (8)
6
2
8
4
15.) When an atom loses two electrons it becomes an ion with a charge of (+2)
-2
+2
-6
+6
16.) When each of the following elements forms ions, the one that does NOT have 8 electrons in its outer ring is (calcium) (?)
calcium
chlorine
hydrogen
sodium
17.) The atomic number of an inert element is (18)
11
18
51
78
18.) Atoms of 3Li will combine with atoms of the element having atomic number (13) (?)
10
11
13
17
19.) When an atom of oxygen gains two electrons, the atom becomes (ion)
an ion
a molecule
a neutron
a proton
20.) H+ represents a (hydrogen ion)
hydrogen atom
proton
hydroxide ion
neutron
This assignment counts a lot for my grade and I'm quite uncertain about these answers. If any are wrong, explanations are greatly appreciated. Thank you for your help,
1.) The number of electrons in the outer ring of the elements in Group II of the Periodic Table is (2)
1
2
3
4
2.) The number of neutrons in the nucleus of an atom of 3Li7 is (4)
10
7
3
4
3.) The element with atomic number 7 is likely to have properties similar to the element whose atomic number is (15)
11
2
15
17
4.) The chloride ion has the same number of orbital electrons as an ion of (Ar)
Ar
K
Mg
Na
5.) The number of neutrons in the nucleus of the element of atomic number 79 and atomic weight 197 is (276)
79
118
197
276
6.) The element of atomic number 87 is (metallic)
amphoteric
inert
metallic
non-metallic
7.) The atom whose nucleus contains the largest number of neutrons is (Option 4)
92U235
92U239
93Np239
94Pu239
8.) Element No. 19 is more active than element No. 11 because element No. 19 (Option 3)
is amphoteric
is a metal
has its valence electron farther from the nucleus
has its valence electron nearer the nucleus
9.) Two man-made elements with atomic numbers greater than 92 are (americium and curium)
americium and curium
thorium and actinium
U238 and U239
U235 and U238
10.) The particle which has the same number of orbital electrons as a potassium ion is (S-2)
Ce+3
K0
Ne0
S-2
11.) The atomic number of an element that is chemically like magnesium is (5) (?)
5
9
14
20
12.) Atoms of U-235 and U-238 differ in structure by three (neutrons)
electrons
mesons
neutrons
protons
13.) Tritium, an isotope of hydrogen, has an atomic number of (1)
1
2
3
4
14.) The maximum number of electrons possible in the second ring (shell) of an atom is (8)
6
2
8
4
15.) When an atom loses two electrons it becomes an ion with a charge of (+2)
-2
+2
-6
+6
16.) When each of the following elements forms ions, the one that does NOT have 8 electrons in its outer ring is (calcium) (?)
calcium
chlorine
hydrogen
sodium
17.) The atomic number of an inert element is (18)
11
18
51
78
18.) Atoms of 3Li will combine with atoms of the element having atomic number (13) (?)
10
11
13
17
19.) When an atom of oxygen gains two electrons, the atom becomes (ion)
an ion
a molecule
a neutron
a proton
20.) H+ represents a (hydrogen ion)
hydrogen atom
proton
hydroxide ion
neutron