Which of the following statements about the periodic table is false?
The vertical columns are called groups.
The vertical columns are called periods.
The vertical column contains elements whose atoms have the same number of electrons in their outer shell.
Elements in the same period:
Have the same number of electron shells.
Have the same number of electrons in their outer shell.
Have similar chemical properties.
Which statement is true?
Elements in Group 1 become more reactive as you move up the group.
Elements in Group 7 become more reactive as you move up the group.
Elements in Group 2 are less reactive than the elements in Group 0.
Elements in the transition element block of the periodic table:
Have ions of the same element with different charges.
Form white compounds.
Are placed between groups 1 and 2 of the periodic table.
Which of the following reactions actually occurs as written?
Br2 + 2NaCl → 2NaBr + Cl2
I2 + 2NaBr → 2NaI + Br2
Cl2 + 2NaI → 2NaCl + I2
Which statement correctly describes the changes Mendeleev made in the development of the periodic table?
He arranged the elements in order of atomic number, swapped some elements so that elements in the same group had similar properties and left gaps for discovered elements.
He arranged the elements in order of atomic weight, swapped some elements so that elements in the same group had different properties and left gaps for undiscovered elements.
He arranged the elements in order of atomic weight, swapped some elements so that elements in the same group had similar properties and left gaps for undiscovered elements.
Which of the following equations represents the balanced symbol equation for the reaction of potassium with water?
2K + H2O → K2O + H2
K + H2O → KOH + H
2K + 2H2O → 2KOH + H2
Which of the following statements about the modern periodic table is not true?
The metals are on the left and the non-metals are on the right.
The elements are arranged in order of increasing atomic number.
Elements increase in reactivity across the periodic table.
The half equation for the formation of potassium ion from a potassium atom is represented as:
K → K+ +e-
K + e → K+
K+ + e- → K
The half equation for the formation of chloride ions from a chlorine molecule is represented as:
Cl2 → 2Cl- + 2e-
Cl2 + 2e- → 2Cl-
2Cl → Cl2 + 2e-