Preliminary Test in Physical Science 11

What is the trend of valence electrons, from left to right, across a row of the periodic table?

• They increase across the period.

• They are all equal across the period.

• They are equal to an atomic number.

• They are equal to the number of the period.

The number of protons in one atom of an element determines the atom’s_____.

• Mass

• Atomic Number

• Weight

• Charge

He proposed that all matter is composed of tiny invisible particles called “atomos”

• Democritus

• Neils Bohr

• John Dalton

• Thales

He discovered the electron through a cathode test tube to study the nature of electric discharges.

• J. J Thompson

• James Chadwick

• John Dalton

• Neils Bohr

All of the following are the subatomic particles of an atom except.

• Proton

• Electron

• Neutron

• Cation

The most abundant element in the universe is________.

• hydrogen

• helium

• carbon

• nitrogen

The man that proved the existence of neutron in 1932.

• J. J Thompson

• James Chadwick

• John Dalton

• Neils Bohr

The negatively charged particle of an atom is_______.

• electron

• neutron

• proton

• isotope

Stars, like our Sun, generate energy by nuclear fusion. Which element is formed when hydrogen  nuclei is fused during nuclear fusion?

• Hydrogen

• Oxygen

• Helium

• Carbon

The two elements created at the beginning of the universe are_________.

• hydrogen & helium

• hydrogen & carbon

• helium & oxygen

• carbon & nitrogen