middle 2 science quiz

All these elements are monovalent except …………………………….

• ₁₁Na

• ₁₉K

• ₃Li

• ₂₀Ca

The most active metal in group (1A) is …………………………….

• cesium

• potassium

• calcium

• sodium

The atomic size of the elements of the same group ………………….. by increasing their atomic  number

• decreases
• stays the same
• increases

• no correct answer

Solutions of Non-metal oxides turn the color of the litmus paper into ................

• blue
• red

• green

• yellow

Elements in Moseley's periodic table are arranged according to the increase of

• atomic number
• alphabetical order
• number of protons
• atomic weight

The modern periodic table consist of-------------------vertical groups.

• 7

• 18

• 16

• 10

Elements of block '‘ S ’' are located--------------------in the periodic table

• on the right side

• in the middle

• on the left side

• below

Noble gases are located in group------------------------

• 18
• 3
• 12
• 7

Elements of the same period have the same------------------------

• number of electrons in outermost energy level.

• number of energy levels.

• atomic number.

• number of protons.

Rutherford discovered that nucleus of atom contains .....................

• negative electrons

• neutrons

• positive protons

• energy levels