1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

Structure of the Atom

Complete the sentences. Choose answers from the box. Each word may be used once, more than once, or not at all.

Ernest Rutherford's alpha particle scattering experiment showed that the major mass of an atom is concentrated in the ____________________.
The subatomic particle with a relative charge of neutral (0) is the ____________________.
The negatively charged particle orbiting the centre of the atom is the ____________________.
The identity of an element is determined by its number of this positive particle: the ____________________.
If an atom loses or gains electrons, it becomes a charged particle called an ____________________.

[5]

Relative Atomic Mass Calculation

Table 1 shows information about two isotopes of element $Y\text{Y}$ .

	Mass number	Percentage (%) abundance
Isotope 1	10	20
Isotope 2	11	80

Calculate the relative atomic mass ( $A_r$ ) of element $Y\text{Y}$ using the equation:

A_r = \frac{(\text{mass number} \times \text{percentage}) \text{ of isotope 1} + (\text{mass number} \times \text{percentage}) \text{ of isotope 2}}{100}

Give your answer to 1 decimal place.

[2]

Identity of Element Y

Suggest the identity of element $Y\text{Y}$ . Use the periodic table.

[1]

Atom Scale Calculation

The radius of an atom of element $Y\text{Y}$ is $8.7 \times 10^{-11}\text{ m}$ .

The radius of the centre of the atom is $000\frac{1}{10\,000}$ of the radius of the atom.

Calculate the radius of the centre of an atom of element $Y\text{Y}$ . Give your answer in standard form.

[2]

Structure of the Atom

Complete the sentences. Choose answers from the box. Each word may be used once, more than once, or not at all.

Ernest Rutherford's alpha particle scattering experiment showed that the major mass of an atom is concentrated in the ____________________.
The subatomic particle with a relative charge of neutral (0) is the ____________________.
The negatively charged particle orbiting the centre of the atom is the ____________________.
The identity of an element is determined by its number of this positive particle: the ____________________.
If an atom loses or gains electrons, it becomes a charged particle called an ____________________.

Mass number

Percentage (%) abundance

Isotope 1

Isotope 2

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions