4. Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed. This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state? (A) 1s°2s²2p°3s?3p°4d! (B) 1s22s²2p°3s²3p°3d! (C) 1s²2s?2d63s²3d°4s' (D) 1s°2s²2p°3s?3p°4s! In a 3.7-gram sample, there are (A) 1.1 x 1022 atoms of gold (B) 3.2 x 1025 atoms of gold (C) 4.4 x 1026 atoms of gold (D) 3.1 x 10-26 atoms of gold 5. atoms of gold (Au). 6. Which total mass is the largest? (A) The mass of 2 electrons (B) The mass of 2 neutrons (C) The mass of 1 electron plus the mass of 1 proton (D) The mass of 1 neutron plus the mass of 1 electron

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Chapter1: Chemical Foundations
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4.
Chemists can identify the composition of some unknown salts by conducting a flame test. When
potassium salts are heated in a flame, a purple color is observed. This is due to the movement of
electrons between energy levels. What is the electron configuration of a potassium atom at ground
state?
(A) 1s²2s²2p63s²3p°4d!
(B) 1s²2s²2p°3s?3p°3d1
(C) 1s²2s²2d®3s²3d$4s!
(D) 1s²2s²2p®3s?3p°4s'
atoms of gold (Au).
In a 3.7-gram sample, there are
(A) 1.1 x 1022 atoms of gold
(B) 3.2 x 1025 atoms of gold
(C) 4.4 x 1026 atoms of gold
(D) 3.1 x 10-26 atoms of gold
5.
6.
Which total mass is the largest?
(A) The mass of 2 electrons
(B) The mass of 2 neutrons
(C) The mass of 1 electron plus the mass of 1 proton
(D) The mass of 1 neutron plus the mass of 1 electron
Transcribed Image Text:4. Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed. This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state? (A) 1s²2s²2p63s²3p°4d! (B) 1s²2s²2p°3s?3p°3d1 (C) 1s²2s²2d®3s²3d$4s! (D) 1s²2s²2p®3s?3p°4s' atoms of gold (Au). In a 3.7-gram sample, there are (A) 1.1 x 1022 atoms of gold (B) 3.2 x 1025 atoms of gold (C) 4.4 x 1026 atoms of gold (D) 3.1 x 10-26 atoms of gold 5. 6. Which total mass is the largest? (A) The mass of 2 electrons (B) The mass of 2 neutrons (C) The mass of 1 electron plus the mass of 1 proton (D) The mass of 1 neutron plus the mass of 1 electron
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