اختبار ساينس Science - اولى اعدادي -مقرر اكتوبر -نموذج 2

Electrons are present in the nucleus

fertilizer are chemical compounds used to improve the agricultural crops

The nucleus is the smallest part of the atom and takes up the least space

The electrons are the lightest in weight of the three subatomic particles

There are the same number of these two particles in an atom

A neutral atoms has 85 protons and 125 neutrons What is its mass number

…….. formulated the first scientific theory about the atom its 

In NPK fertilizer. The element needed to  developing strong roots is Nitrogen

In NPK fertilizer. The element needed for the greening of plant leaves is: 

Ancient Greek philosophers believed that matter was made up of small, indivisible parts called Atoms

The number of negative electrons in the atom in its normal state equals

A neutral atoms has 85 protons and 125 neutrons How many electrons does atoms has?  

The fertilizer NPK composed of three compound containing the elements  

There are …….. main energy levels

Where is most of the mass of an atom located? 

The mass number is represented by the symbol A and is written at the ……….side of the element symbol

The masses of subatomic components in the atomic mass units are measured in atomic mass units ( u)

What does the atomic mass represent? 

The subatomic particle with no electrical charge is the ........

The subatomic particle with a negative charge is the 

In NPK fertilizer. The element necessary for healthy growth  of the plant is phosphorus

The atomic  number is represented by the symbol Z and is written at the  ….side of the element symbol

A neutral atoms has 85 protons and 125 neutrons What is its atomic number.........

Isotopes are the atoms of an element with different numbers of protons but the same number of neutrons 

When the elements differ between English and Latin name its symbol is taken from its 

……..revolve around the nucleus at different energy level according to their energy 

How do you find the number of neutrons in an atom ? 

The number of electrons required to saturate the first four levels of energy can be determined by the mathematical relationship

How many electrons can each level hold? 

The subatomic particle with a positive charge is the …………

The outmost energy level of any atom does not contain more than

Dalton formulated the first scientific theory about the atom,  showing that the atoms are divisible

The mass of the electrons is neglected in calculation of the atomic mass

The atomic number is the number of protons an atom contains 

The atomic number is the same as the number of