SCIENCE 9 - 2ND Quarterly Exam

What do you call the central mass of the atom?

• Proton

• Electron

• nucleus

• neutron

What is the electrical charge of Neutron?

• Positive

• Zero

• negative

• all of the above

Which of the three sub-atomic particles are found outside of the nucleus?

• The proton

• The neutron

• The electron

• None of the three subatomic particles

It is said that atoms contain charged particles, why do they not have a charge?

• They contain the same number of protons and electrons.

• The charge is locked away in the nucleus.

• They contain equal numbers of protons and neutrons.

• They contain the same number of electrons and neutrons.

Which of the following statements about orbitals is false?

• Orbitals are distributed in space around the nucleus.

• Orbitals are regions in which electrons are most likely located.

• Orbitals show the path of the electron.

• Orbitals are part of one model for atomic structure.

Which type of bond is formed by the transfer of electrons from one atom to another?

• hydrogen bond

• covalent bond

• ionic bond

• electron bond

Why do you think atoms undergoes chemical bonding?

• to attain stability

• to form into another atom

• lose stability

• to produce ions

Which type of bonds is formed by the transfer of electrons from one atom to another?

• hydrogen bond

• covalent bond

• ionic bond

• electron bond

Which atoms are most likely to form covalent bond?

• nonmetal atoms that share electrons

• nonmetal atoms that share protons

• metal atoms that share protons

• metal atoms that share electrons

Which of the following best describes the properties of an ionic compound?

• low melting point, tendency to transfer electrons

• low melting point, tendency to share electrons

• high melting point, tendency to transfer electrons

• high melting point, tendency to share electrons