Science

Consider the following reaction what type of bond is holding the two atoms together Na+Cl-Na+cl- -Nacl

• Convalent

• Ionic

• Hydrogen

• Radioactive

Ions are formed when

• Protons and neutrons combine

• An atoms loses or gains electrons

• Isotopes divide rapidly

• Elements dispear from the periodic table

Blank is the smallest unit of matter that retains the property of an element

• Molecule

• Compounds

• Atoms

• Ions

The sub atomic units in the nucleus of an element contains

• Equal number of protons neutrons and electrons

• Equal number of protons and neutrons only

• Equal number of protons and electrons but not neutrons

• Wrong

The type of bound that exits in water molecules is called

• Hydrogen bond

• Van der waals bond

• Electromagnetic bond

• Radioactive bond

An element had a neutron number of 17 what is the number of protons in the nucleus of that element

• 17

• 18

• 34

• Wrong

Atoms becomes charged when

• An atoms loses electrons

• An electron rotates round the nucleus

• An electron combines with another electron

• An atom gains electrons

Atomic number is the same as

• Number of elements on the periodic table

• Number of protons in the nucleus of an element

• Number of protons and neutrons

• Number of electrons that are negatively charged

Isotopes of an element have the same number of ———- and different numbers of

• Protons and neutrons

• Protons and electrons

• Neutrons and protons

• Electrons and protons

What is the mass number of an element that has a proton number of 10

• 12

• 10

• 20

• Non of the above