1 Who originally arranged the elements in order of increasing atomic mass in the periodic table? A Mendeleev B Moseley C Dalton D Rutherford
3 As you move from left to right across a period, the atomic size of elements generally: A Increases B Decreases C Remains the same D First increases then decreases
5 According to Moseley, the modern periodic table is based on which property of elements? A Atomic mass B Atomic number C Density D Valency
7 The group number of an element in the modern periodic table is related to its: A Number of shells B Number of valence electrons C Atomic mass D Number of neutrons
8 Which scientist arranged the elements in the modern periodic table on the basis of increasing atomic number? A Mendeleev B Moseley C Dalton D Rutherford
9 Which block of the periodic table contains the alkali metals? A s-block B p-block C d-block D f-block
10 Elements in the same group of the periodic table have similar chemical properties because they have the same: A Number of shells B Number of valence electrons C Atomic mass D Number of neutrons
12 Which group of the modern periodic table contains the noble gases? A Group 1 B Group 2 C Group 17 D Group 18
13 Which group of elements in the periodic table is known as the alkali metals? A Group 1 B Group 2 C Group 17 D Group 18
14 Which group of the periodic table contains the halogens? A Group 1 B Group 2 C Group 17 D Group 18
15 Why do alkali metals show similar chemical properties? A They have the same number of neutrons B They have one valence electron C They have full outer shells D They have seven valence electrons
16 Which property generally increases as we move from left to right across a period? A Atomic size B Metallic character C Electronegativity D Number of shells
18 Elements of a group have the same: A Number of shells B Number of valence electrons C Atomic mass D Number of neutrons
19 Who arranged elements in order of increasing atomic number? A Mendeleev B Moseley C Newlands D Dobereiner
20 In the modern periodic table, elements of a group have the same number of: A Neutrons B Energy shells C Valence electrons D Protons
21 Which of the following is the most reactive metal in the reactivity series? A Sodium B Potassium C Magnesium D Copper
23 Noble gases are placed in which group of the periodic table? A Group 1 B Group 2 C Group 17 D Group 18
24 Moving from left to right across a period, what happens to the atomic size of elements? A It increases. B It decreases. C It remains the same. D It first increases then decreases.